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Egyptian Board Gastroenterology & Hepatology study materials
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Egyptian Board Gastroenterology & Hepatology practice questions

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Question 1Esophageal Disorders

A 42-year-old man reports heartburn and regurgitation for 3 months with no alarm features. According to accepted management of uninvestigated gastro-oesophageal reflux disease in adults, which initial strategy is most appropriate?

  1. Routine endoscopic biopsy of the gastric antrum
  2. Empirical trial of a proton pump inhibitor for 4 to 8 weeks Correct answer.
  3. Lifelong daily prokinetic therapy
  4. Immediate 24-hour oesophageal pH monitoring

Explanation

In uncomplicated reflux symptoms without alarm features such as dysphagia, weight loss, anaemia or vomiting, an empirical proton pump inhibitor trial for four to eight weeks is the recommended first step. It is both diagnostic and therapeutic, and invasive testing is reserved for failure or alarm presentations.

Question 2Esophageal Disorders

Which finding on upper endoscopy is the most reliable mucosal marker of gastro-oesophageal reflux disease?

  1. Duodenal lymphangiectasia
  2. Fundic gland polyps
  3. Distal oesophageal mucosal breaks Correct answer.
  4. Antral erosions

Explanation

Erosive oesophagitis, described as mucosal breaks at the distal oesophagus, is the endoscopic hallmark of reflux disease and is graded by the Los Angeles classification. Many patients with reflux have normal mucosa, so the absence of breaks does not exclude the diagnosis, but their presence is specific.

Question 3Esophageal Disorders

A 30-year-old woman has intermittent solid-food dysphagia. Barium swallow shows a smooth tapering 'bird-beak' narrowing at the lower oesophagus, and manometry shows absent peristalsis with failure of lower oesophageal sphincter relaxation. What is the most likely diagnosis?

  1. Eosinophilic oesophagitis
  2. Achalasia Correct answer.
  3. Scleroderma oesophagus
  4. Diffuse oesophageal spasm

Explanation

The combination of absent peristalsis and incomplete lower sphincter relaxation on manometry, with a smooth tapering narrowing on barium study, defines achalasia. Diffuse spasm and scleroderma retain different manometric patterns, and eosinophilic oesophagitis typically produces rings, strictures or a normal study.

Question 4Esophageal Disorders

Which clinical feature most strongly suggests eosinophilic oesophagitis rather than reflux disease in a young adult with dysphagia?

  1. Nocturnal cough
  2. Heartburn relieved by antacids
  3. A history of food impaction requiring endoscopic removal Correct answer.
  4. Symptoms that worsen after fatty meals

Explanation

Food impaction and intermittent solid-food dysphagia in a young adult with an atopic background are characteristic of eosinophilic oesophagitis. Reflux-related symptoms such as meal-related heartburn and nocturnal cough overlap but are less discriminating, and diagnosis requires oesophageal eosinophilia on biopsy.

Question 5Esophageal Disorders

A patient with cirrhosis presents with haematemesis. Endoscopy shows large oesophageal varices with red wale marks. Which pharmacological agent is recommended to reduce the risk of further variceal bleeding in this acute setting?

  1. Intravenous ondansetron
  2. Intravenous octreotide Correct answer.
  3. Oral sucralfate
  4. Oral propranolol started immediately

Explanation

Vasoactive drugs such as octreotide, terlipressin or somatostatin are given early in suspected variceal haemorrhage to reduce portal pressure and control bleeding. Non-selective beta-blockers are used for prophylaxis, not during the acute bleed, because they lower blood pressure and are ineffective acutely.

Question 6Esophageal Disorders

A 55-year-old man has dysphagia and odynophagia after a course of doxycycline taken with little water at bedtime. Endoscopy shows a discrete ulcer in the mid-oesophagus with normal surrounding mucosa. What is the most likely cause?

  1. Pill-induced oesophagitis Correct answer.
  2. Candida oesophagitis
  3. Herpes simplex oesophagitis
  4. Oesophageal carcinoma

Explanation

Doxycycline is a well-recognised cause of pill oesophagitis, especially when taken with insufficient fluid or while recumbent, producing a focal ulcer with normal adjacent mucosa. Candidiasis and herpes produce different mucosal appearances and typically occur in immunocompromised hosts.

Question 7Esophageal Disorders

Which statement best describes the role of oesophageal manometry in the evaluation of oesophageal disorders?

  1. It directly measures mucosal acid exposure over 24 hours
  2. It visualises mucosal breaks and strictures
  3. It detects oesophageal eosinophilic infiltration
  4. It assesses oesophageal body peristalsis and sphincter function Correct answer.

Explanation

High-resolution manometry evaluates peristaltic contraction patterns and lower and upper sphincter pressure and relaxation, which is essential for motility disorders such as achalasia. Acid exposure is measured by pH monitoring, eosinophils by biopsy, and mucosal lesions by endoscopy.

Question 8Esophageal Disorders

A 48-year-old woman has reflux symptoms that persist despite 8 weeks of twice-daily proton pump inhibitor therapy. Endoscopy is normal. Which next investigation is most appropriate to confirm pathological acid exposure?

  1. Oesophageal manometry as the first test
  2. Ambulatory 24-hour oesophageal pH-impedance monitoring Correct answer.
  3. Barium swallow
  4. Repeat endoscopy with random biopsies

Explanation

When reflux symptoms persist despite an adequate proton pump inhibitor trial and endoscopy is normal, ambulatory pH or pH-impedance monitoring is used to document pathological acid or non-acid reflux. Manometry is used to position the pH catheter and exclude motility disorders but does not measure reflux.

Question 9Esophageal Disorders

A 60-year-old man has long-standing Barrett's oesophagus with a segment of 5 cm and no dysplasia on two consecutive surveillance endoscopies. What is the recommended surveillance interval?

  1. Every 3 months
  2. Every 3 to 5 years Correct answer.
  3. Every 6 months
  4. No further surveillance is required

Explanation

Non-dysplastic Barrett's oesophagus is managed with surveillance endoscopy every three to five years, with biopsies according to the Seattle protocol. Shorter intervals are reserved for dysplasia, and surveillance is not abandoned in an otherwise fit patient.

Question 10Esophageal Disorders

A 35-year-old woman has achalasia confirmed by manometry. She is concerned about the durability of treatment. Which statement about pneumatic balloon dilatation versus laparoscopic Heller myotomy is most accurate?

  1. Myotomy does not require an anti-reflux procedure
  2. Balloon dilatation is preferred in patients with a mega-oesophagus
  3. Heller myotomy is contraindicated in patients under 40 years
  4. Balloon dilatation has a higher risk of perforation than myotomy Correct answer.

Explanation

Pneumatic dilatation carries a recognised risk of oesophageal perforation of roughly 1 to 3 percent per session, whereas laparoscopic Heller myotomy has a lower perforation risk but is surgical. Both are effective, and myotomy is usually combined with a partial fundoplication to limit post-procedure reflux.

Question 11Esophageal Disorders

A 70-year-old man has progressive solid-food dysphagia and 8 kg weight loss over 3 months. Endoscopy shows an irregular ulcerated mass in the mid-oesophagus. Which statement about oesophageal squamous cell carcinoma is most accurate?

  1. It is associated with achalasia and caustic strictures Correct answer.
  2. It is the predominant histological type in Western countries
  3. It is unrelated to tobacco and alcohol use
  4. It usually arises in the distal oesophagus and cardia

Explanation

Squamous cell carcinoma of the oesophagus is strongly associated with tobacco, alcohol, achalasia, caustic stricture and prior head and neck cancer. In Western populations adenocarcinoma arising from Barrett's mucosa predominates, whereas squamous carcinoma is more common in parts of Asia and Africa.

Question 12Esophageal Disorders

A patient with systemic sclerosis develops severe heartburn and regurgitation. Which manometric pattern is most typical of scleroderma oesophageal involvement?

  1. Hypertensive lower oesophageal sphincter with normal peristalsis
  2. Premature contractions with normal sphincter relaxation
  3. Absent peristalsis with a patulous lower oesophageal sphincter Correct answer.
  4. Normal manometry with isolated reflux on pH study

Explanation

Scleroderma causes smooth muscle atrophy and fibrosis, producing weak or absent peristalsis and a hypotensive, patulous lower oesophageal sphincter that permits severe reflux. This combination explains the high prevalence of erosive oesophagitis and stricture in these patients.

Question 13Esophageal Disorders

A 28-year-old man has recurrent food impaction and peripheral eosinophilia. Oesophageal biopsies show 30 eosinophils per high-power field. Which initial therapy is most appropriate?

  1. Topical swallowed corticosteroid therapy Correct answer.
  2. Long-term high-dose proton pump inhibitor alone
  3. Laparoscopic Heller myotomy
  4. Pneumatic balloon dilatation

Explanation

Eosinophilic oesophagitis responds to swallowed topical corticosteroids such as fluticasone or budesonide, or to dietary elimination, and treatment also reduces the risk of recurrent impaction and stricture. Proton pump inhibitor trials are used to exclude reflux-associated eosinophilia but are not sufficient long-term monotherapy for established disease.

Question 14Esophageal Disorders

A 65-year-old man has a 6 cm oesophageal adenocarcinoma with no nodal or distant metastases on staging. Which management approach is most appropriate?

  1. Observation with 3-monthly endoscopy
  2. Neoadjuvant chemoradiotherapy followed by oesophagectomy Correct answer.
  3. Palliative stenting alone
  4. Endoscopic mucosal resection alone

Explanation

Locally advanced but resectable oesophageal adenocarcinoma without distant spread is best treated with neoadjuvant chemoradiotherapy followed by surgical resection, which improves survival compared with surgery alone. Endoscopic resection is reserved for superficial lesions confined to the mucosa.

Question 15Esophageal Disorders

A 52-year-old woman has achalasia and is being considered for peroral endoscopic myotomy. Which statement about this procedure compared with laparoscopic Heller myotomy is most accurate?

  1. It is contraindicated in patients with prior endoscopic therapy
  2. It requires a permanent feeding tube
  3. It avoids a surgical incision but carries a higher rate of postoperative reflux than Heller myotomy with fundoplication Correct answer.
  4. It cannot be performed in patients with type III achalasia

Explanation

Peroral endoscopic myotomy is a minimally invasive endoscopic technique with efficacy comparable to Heller myotomy, but because no anti-reflux procedure is added, postoperative reflux is more frequent. It is particularly useful in type III (spastic) achalasia and does not require a permanent feeding tube.

Question 16Esophageal Disorders

A 58-year-old man with cirrhosis and known oesophageal varices is started on a non-selective beta-blocker for primary prophylaxis. Which statement about this therapy is most accurate?

  1. It eliminates the need for surveillance endoscopy
  2. It should be avoided in patients with Child-Pugh class A disease
  3. It reduces portal pressure by causing splanchnic vasoconstriction and reduced cardiac output Correct answer.
  4. It is most effective in patients with a hepatic venous pressure gradient below 10 mmHg

Explanation

Non-selective beta-blockers such as propranolol and carvedilol lower portal pressure through reduced cardiac output and splanchnic vasoconstriction, reducing the risk of first variceal haemorrhage. They are indicated in patients with medium or large varices and are not a substitute for continued surveillance.

Question 17Gastroduodenal Disorders (including H. pylori, peptic ulcer disease, and gastric neoplasia)

A 38-year-old man has a 1.5 cm clean-based duodenal ulcer. He is H. pylori positive on a validated stool antigen test and has no alarm features. What is the most appropriate initial management?

  1. High-dose PPI alone for 8 weeks with repeat endoscopy
  2. Standard-dose PPI plus amoxicillin, clarithromycin, and metronidazole for 14 days Correct answer.
  3. Amoxicillin and clarithromycin dual therapy for 7 days
  4. Surgical vagotomy referral after failed medical therapy

Explanation

Eradication of H. pylori heals duodenal ulcers and prevents recurrence, so all infected patients with peptic ulcer disease should receive eradication therapy. A 14-day bismuth or non-bismuth quadruple regimen is recommended in most guidelines given rising clarithromycin resistance, and PPI therapy is included throughout.

Question 18Gastroduodenal Disorders (including H. pylori, peptic ulcer disease, and gastric neoplasia)

Which finding on upper endoscopy is most characteristic of a gastric ulcer that should raise concern for malignancy?

  1. Multiple small erosions with a diffuse erythematous mucosa
  2. An ulcer with a heaped-up, irregular margin and nodular base Correct answer.
  3. A linear ulcer along the lesser curvature with a clean base
  4. A shallow ulcer with radiating folds in the antrum

Explanation

Malignant gastric ulcers typically show irregular, heaped-up or nodular margins, an uneven base, and loss of normal fold convergence. Benign ulcers usually have smooth, punched-out margins with radiating folds. All gastric ulcers should be biopsied regardless of appearance.

Question 19Gastroduodenal Disorders (including H. pylori, peptic ulcer disease, and gastric neoplasia)

A patient with a bleeding duodenal ulcer undergoes endoscopic therapy with epinephrine injection and a hemoclip. Which additional measure most reduces rebleeding and mortality?

  1. High-dose intravenous PPI therapy for 72 hours Correct answer.
  2. Routine nasogastric lavage for 72 hours
  3. Prophylactic antibiotics for 7 days
  4. Immediate H. pylori serology testing

Explanation

After successful endoscopic hemostasis of a high-risk bleeding ulcer, high-dose intravenous PPI (bolus then continuous infusion) for 72 hours stabilizes the clot and reduces rebleeding, surgery, and mortality. Combination endoscopic therapy plus PPI is the standard of care.

Question 20Gastroduodenal Disorders (including H. pylori, peptic ulcer disease, and gastric neoplasia)

A 55-year-old woman has dyspepsia with no alarm features and is H. pylori negative on a urea breath test after appropriate preparation. She is not on NSAIDs. What is the next best step?

  1. Lifelong H2-receptor antagonist therapy
  2. Immediate referral for gastrectomy
  3. Empiric trial of PPI therapy Correct answer.
  4. Repeat urea breath test in 1 week

Explanation

In H. pylori-negative dyspepsia without alarm features, an empiric PPI trial is appropriate; endoscopy is reserved for alarm features, older age thresholds, or failure of empiric therapy. This strategy avoids unnecessary procedures while treating acid-related symptoms.

Question 21Gastroduodenal Disorders (including H. pylori, peptic ulcer disease, and gastric neoplasia)

Which statement about gastric adenocarcinoma is correct?

  1. It is always associated with pernicious anemia
  2. It is more common in the duodenum than in the stomach
  3. It is unrelated to H. pylori infection
  4. It is the most common gastric malignancy and often presents with advanced disease Correct answer.

Explanation

Gastric adenocarcinoma accounts for the vast majority of gastric malignancies and frequently presents at an advanced stage because early disease is often asymptomatic. H. pylori is the strongest established risk factor, and intestinal-type tumors often arise from chronic atrophic gastritis.

Question 22Gastroduodenal Disorders (including H. pylori, peptic ulcer disease, and gastric neoplasia)

A 60-year-old man with a gastric ulcer undergoes biopsy, and pathology shows MALT lymphoma confined to the stomach. He is H. pylori positive. What is the initial treatment?

  1. Radiation therapy to the stomach
  2. Systemic chemotherapy alone
  3. H. pylori eradication therapy Correct answer.
  4. Immediate total gastrectomy

Explanation

Gastric MALT lymphoma is strongly associated with H. pylori, and eradication therapy alone induces remission in a substantial proportion of localized cases. Response is assessed by repeat endoscopy and biopsy; chemotherapy or radiotherapy is reserved for nonresponders or advanced disease.

Question 23Gastroduodenal Disorders (including H. pylori, peptic ulcer disease, and gastric neoplasia)

Which test is most appropriate to confirm eradication of H. pylori after treatment?

  1. Rapid urease test on a single antral biopsy
  2. IgG serology 4 weeks after therapy
  3. Stool antigen test performed during the last week of therapy
  4. Urea breath test at least 4 weeks after stopping antibiotics and PPI Correct answer.

Explanation

Eradication should be confirmed with a urea breath test or stool antigen test performed at least 4 weeks after completing antibiotics and 1-2 weeks after stopping PPI. Serology cannot distinguish past from current infection, and testing during therapy can yield false-negative results.

Question 24Gastroduodenal Disorders (including H. pylori, peptic ulcer disease, and gastric neoplasia)

A patient presents with sudden severe epigastric pain, board-like abdominal rigidity, and free air under the diaphragm. Which diagnosis is most likely?

  1. Acute pancreatitis
  2. Perforated peptic ulcer Correct answer.
  3. Acute cholecystitis
  4. Gastric outlet obstruction

Explanation

Sudden severe epigastric pain with peritonitis and pneumoperitoneum indicates a perforated peptic ulcer, most often duodenal. Management includes resuscitation, broad-spectrum antibiotics, and urgent surgical consultation.

Question 25Gastroduodenal Disorders (including H. pylori, peptic ulcer disease, and gastric neoplasia)

Which factor most strongly increases the risk of peptic ulcer bleeding in a patient taking low-dose aspirin?

  1. Taking aspirin with food
  2. A family history of dyspepsia
  3. Concurrent use of a nonsteroidal anti-inflammatory drug Correct answer.
  4. Male sex alone

Explanation

Concurrent NSAID use markedly increases gastrointestinal bleeding risk in aspirin users because both agents impair mucosal prostaglandin synthesis and platelet function. Clinicians should avoid this combination or add gastroprotection when unavoidable.

Question 26Gastroduodenal Disorders (including H. pylori, peptic ulcer disease, and gastric neoplasia)

A 70-year-old woman has early gastric cancer limited to the mucosa with no lymph node involvement and no ulceration, measuring 1.5 cm. What is the most appropriate management?

  1. Total gastrectomy with D2 lymphadenectomy
  2. Palliative chemotherapy
  3. Endoscopic submucosal dissection Correct answer.
  4. Observation with annual endoscopy

Explanation

Early gastric cancer confined to the mucosa, without ulceration, and under 2 cm meets criteria for endoscopic submucosal dissection, which offers curative resection with organ preservation. Surgery is reserved for lesions that do not meet these criteria or show lymphovascular invasion.

Question 27Gastroduodenal Disorders (including H. pylori, peptic ulcer disease, and gastric neoplasia)

Which medication is associated with the highest risk of peptic ulcer disease when used alone?

  1. Calcium channel blockers
  2. Metformin
  3. Acetaminophen
  4. Nonsteroidal anti-inflammatory drugs Correct answer.

Explanation

NSAIDs inhibit cyclooxygenase and reduce protective prostaglandin synthesis, making them the most important drug cause of peptic ulcer disease. Risk increases with higher doses, older age, and concomitant corticosteroids or anticoagulants.

Question 28Gastroduodenal Disorders (including H. pylori, peptic ulcer disease, and gastric neoplasia)

A patient with dyspepsia undergoes endoscopy and is found to have a gastric ulcer. Which statement about biopsy is correct?

  1. Biopsies should be taken from the ulcer margin and base Correct answer.
  2. A single biopsy from the center is sufficient
  3. Biopsy should be avoided because it causes bleeding
  4. Biopsy is unnecessary if the ulcer appears benign

Explanation

Gastric ulcers must be biopsied to exclude malignancy, with multiple biopsies taken from the ulcer margin and base. Even apparently benign ulcers should be biopsied, and repeat endoscopy is often advised to document healing.

Question 29Gastroduodenal Disorders (including H. pylori, peptic ulcer disease, and gastric neoplasia)

A 45-year-old man with H. pylori infection has failed clarithromycin-based triple therapy. What is the preferred next-line regimen?

  1. PPI alone for 8 weeks
  2. Bismuth quadruple therapy for 14 days Correct answer.
  3. Repeat the same triple therapy for 14 days
  4. Amoxicillin monotherapy for 4 weeks

Explanation

After failure of clarithromycin triple therapy, bismuth quadruple therapy (PPI, bismuth, tetracycline, and metronidazole) is preferred because it overcomes macrolide resistance and has high eradication rates. Susceptibility-guided therapy is an alternative where available.

Question 30Gastroduodenal Disorders (including H. pylori, peptic ulcer disease, and gastric neoplasia)

Which endoscopic finding is most consistent with gastric outlet obstruction caused by peptic ulcer disease?

  1. A large hiatal hernia
  2. A duodenal bulb with a clean base ulcer
  3. A retained food residue in the stomach with a narrowed pylorus Correct answer.
  4. Diffuse esophageal varices

Explanation

Gastric outlet obstruction from peptic ulcer disease presents with a narrowed pylorus or duodenal bulb and retained gastric contents after fasting. Patients typically report early satiety, vomiting of undigested food, and weight loss.

Question 31Gastroduodenal Disorders (including H. pylori, peptic ulcer disease, and gastric neoplasia)

A 65-year-old man has a gastric ulcer that has not healed after 8 weeks of PPI therapy and H. pylori eradication. What is the most important next step?

  1. Reassure the patient and stop follow-up
  2. Increase the PPI dose indefinitely
  3. Start long-term corticosteroid therapy
  4. Repeat endoscopy with biopsy Correct answer.

Explanation

A nonhealing gastric ulcer requires repeat endoscopy with biopsy to exclude malignancy and to reassess the cause, including NSAID use and persistent infection. Failure to heal is a red flag that mandates tissue diagnosis.

Question 32Gastroduodenal Disorders (including H. pylori, peptic ulcer disease, and gastric neoplasia)

Which of the following is the most common cause of peptic ulcer disease in patients not taking NSAIDs?

  1. Cytomegalovirus infection
  2. Crohn disease
  3. Helicobacter pylori infection Correct answer.
  4. Zollinger-Ellison syndrome

Explanation

H. pylori is the leading cause of peptic ulcer disease worldwide, especially duodenal ulcers, followed by NSAID use. Less common causes include Zollinger-Ellison syndrome and viral or systemic infections.

Question 33Gastroduodenal Disorders (including H. pylori, peptic ulcer disease, and gastric neoplasia)

A patient with known H. pylori infection is being started on long-term NSAID therapy. Which strategy best reduces ulcer risk?

  1. Avoid all acid suppression during NSAID therapy
  2. Use aspirin instead of an NSAID without gastroprotection
  3. Eradicate H. pylori and use a PPI for gastroprotection Correct answer.
  4. Use an H2-receptor antagonist only at bedtime

Explanation

Eradicating H. pylori before starting NSAIDs and co-prescribing a PPI reduces the risk of NSAID-related ulcers and bleeding. This combined approach addresses both major risk factors.

Question 34Gastroduodenal Disorders (including H. pylori, peptic ulcer disease, and gastric neoplasia)

Which statement best describes the role of endoscopy in a 30-year-old patient with dyspepsia and no alarm features who is H. pylori negative?

  1. Endoscopy is routinely indicated for all dyspepsia
  2. Endoscopy is contraindicated in young patients
  3. Endoscopy is not routinely required and empiric PPI therapy is reasonable Correct answer.
  4. Endoscopy is indicated only if the patient requests it

Explanation

In young patients without alarm features and with negative H. pylori testing, empiric acid suppression is appropriate and endoscopy is not routinely required. Endoscopy is reserved for alarm features, older age, or failure of empiric therapy.

Question 35Small Bowel and Malabsorption

A 24-year-old Egyptian man presents with chronic diarrhea, iron-deficiency anemia, and positive anti-tissue transglutaminase IgA antibodies with a normal total IgA level. Duodenal biopsies show increased intraepithelial lymphocytes, crypt hyperplasia, and villous blunting. Which diagnosis is most consistent with these findings?

  1. Whipple disease
  2. Celiac disease Correct answer.
  3. Tropical sprue
  4. Eosinophilic gastroenteritis

Explanation

Positive anti-tissue transglutaminase IgA with a normal total IgA, combined with villous blunting, crypt hyperplasia, and intraepithelial lymphocytosis, is the classic serologic and histologic picture of celiac disease. The serology links the mucosal injury to gluten-driven autoimmunity rather than to infection.

Question 36Small Bowel and Malabsorption

Which serologic test is most appropriate for initial screening of suspected celiac disease in a patient with known selective IgA deficiency?

  1. Anti-endomysial IgA
  2. Anti-tissue transglutaminase IgG Correct answer.
  3. Anti-tissue transglutaminase IgA
  4. Antigliadin IgA

Explanation

Patients with selective IgA deficiency cannot mount reliable IgA-based serologic responses, so IgA-based tests such as anti-tTG IgA or anti-endomysial IgA give false-negative results. IgG-based anti-tissue transglutaminase is the recommended screening test in this setting.

Question 37Small Bowel and Malabsorption

A patient with chronic diarrhea is suspected of having bile acid diarrhea. Which pathophysiologic mechanism best explains this condition?

  1. Loss of brush-border lactase causes osmotic diarrhea
  2. Small intestinal bacterial overgrowth deconjugates bile salts
  3. Reduced pancreatic enzyme output causes fat maldigestion
  4. Excess bile acids escaping into the colon stimulate colonic water secretion Correct answer.

Explanation

Bile acid diarrhea occurs when bile acids are not adequately reabsorbed in the terminal ileum and reach the colon, where they stimulate adenylate cyclase and increase colonic secretion and motility. This is a secretory mechanism rather than an osmotic or maldigestive one.

Question 38Small Bowel and Malabsorption

Which finding on small bowel biopsy is most characteristic of Whipple disease?

  1. Giardia trophozoites adherent to enterocytes
  2. PAS-positive macrophages in the lamina propria Correct answer.
  3. Villous blunting with intraepithelial lymphocytosis
  4. Subepithelial collagen band thickening

Explanation

Whipple disease is caused by Tropheryma whipplei and is diagnosed by the presence of PAS-positive, diastase-resistant macrophages in the lamina propria of the small intestine. These macrophages contain the organism and are the histologic hallmark of the disease.

Question 39Small Bowel and Malabsorption

A 45-year-old woman has chronic diarrhea and weight loss after a prolonged course of broad-spectrum antibiotics. Hydrogen breath testing after glucose administration shows an early peak. Which diagnosis is most likely?

  1. Lactose intolerance
  2. Celiac disease
  3. Small intestinal bacterial overgrowth Correct answer.
  4. Pancreatic exocrine insufficiency

Explanation

An early hydrogen peak after glucose breath testing reflects bacterial fermentation of the sugar in the small bowel, which is the hallmark of small intestinal bacterial overgrowth. The antecedent antibiotic exposure is a recognized predisposing factor because it disturbs the normal flora and motility.

Question 40Small Bowel and Malabsorption

Which laboratory abnormality is most characteristic of severe vitamin B12 deficiency due to terminal ileal disease?

  1. Macrocytic anemia with hypersegmented neutrophils Correct answer.
  2. Isolated thrombocytosis
  3. Low serum ferritin
  4. Microcytic hypochromic anemia

Explanation

Vitamin B12 is absorbed in the terminal ileum, so disease or resection of this segment causes deficiency. The resulting megaloblastic hematopoiesis produces macrocytic anemia with hypersegmented neutrophils and often neurologic features.

Question 41Small Bowel and Malabsorption

A patient with suspected celiac disease has been on a strict gluten-free diet for six months but continues to have diarrhea and weight loss. Which step is most appropriate next in evaluation?

  1. Increase gluten intake to confirm the diagnosis
  2. Repeat anti-tissue transglutaminase serology only
  3. Repeat duodenal biopsy to assess for refractory celiac disease or alternative diagnosis Correct answer.
  4. Start empirical corticosteroids without further testing

Explanation

Nonresponse to a gluten-free diet warrants reassessment, including verification of dietary adherence, repeat serology, and usually repeat duodenal biopsy to look for refractory celiac disease or an alternative cause. Biopsy is the definitive way to distinguish persistent mucosal injury from other diagnoses.

Question 42Small Bowel and Malabsorption

Which test is considered the reference standard for diagnosing exocrine pancreatic insufficiency in a patient with chronic diarrhea and weight loss?

  1. Abdominal ultrasound
  2. Serum amylase
  3. Fecal calprotectin
  4. Fecal elastase-1 Correct answer.

Explanation

Fecal elastase-1 is a widely used, noninvasive test of exocrine pancreatic function and is considered a practical reference standard for pancreatic insufficiency. Low values indicate reduced pancreatic enzyme output and support the diagnosis.

Question 43Small Bowel and Malabsorption

A patient with chronic diarrhea is found to have a positive anti-tissue transglutaminase IgA and villous atrophy on biopsy. Which associated condition should be specifically screened for because of its strong association with celiac disease?

  1. Osteoarthritis
  2. Type 1 diabetes mellitus Correct answer.
  3. Rheumatoid arthritis
  4. Chronic obstructive pulmonary disease

Explanation

Celiac disease is strongly associated with other autoimmune conditions, particularly type 1 diabetes mellitus, autoimmune thyroid disease, and dermatitis herpetiformis. Screening for type 1 diabetes is therefore recommended in newly diagnosed celiac patients.

Question 44Small Bowel and Malabsorption

A 60-year-old man has chronic diarrhea and weight loss, and small bowel biopsy shows villous blunting with increased intraepithelial lymphocytes but no response to a gluten-free diet. Which additional diagnosis should be considered?

  1. Refractory celiac disease Correct answer.
  2. Irritable bowel syndrome
  3. Acute gastroenteritis
  4. Lactose intolerance

Explanation

Persistent villous blunting and intraepithelial lymphocytosis despite a strict gluten-free diet suggest refractory celiac disease, which requires further evaluation including repeat biopsy and immunophenotyping. Irritable bowel syndrome and lactose intolerance do not cause villous atrophy.

Question 45Small Bowel and Malabsorption

Which dietary component must be eliminated to control symptoms in a patient with newly diagnosed celiac disease?

  1. Fructose-containing fruits
  2. High-fiber vegetables
  3. Lactose-containing dairy products
  4. Gluten-containing grains such as wheat, barley, and rye Correct answer.

Explanation

Celiac disease is triggered by gluten, a protein found in wheat, barley, and rye, so a lifelong gluten-free diet is the cornerstone of treatment. Eliminating lactose or fructose addresses different intolerances and does not treat celiac disease.

Question 46Small Bowel and Malabsorption

A patient with chronic diarrhea and malabsorption is found to have a markedly elevated fecal fat measurement. Which mechanism is most consistent with this finding?

  1. Rapid gastric emptying
  2. Impaired intraluminal digestion or absorption of fat Correct answer.
  3. Excessive dietary fiber intake
  4. Increased colonic secretion of water

Explanation

Steatorrhea, reflected by elevated fecal fat, results from defective intraluminal digestion or mucosal absorption of fat, as seen in pancreatic insufficiency, bile salt deficiency, or small bowel disease. Secretory or motility disorders typically cause watery diarrhea without excess fecal fat.

Question 47Inflammatory Bowel Disease

A 28-year-old man with ulcerative colitis has had six bloody stools per day for two weeks, temperature 37.9 °C, haemoglobin 10.8 g/dL, CRP 45 mg/L, and no signs of toxicity or tachycardia. According to the Truelove and Witts criteria, how should this flare be classified?

  1. Mild flare
  2. Fulminant flare requiring urgent colectomy assessment
  3. Moderate flare Correct answer.
  4. Severe flare

Explanation

Truelove and Witts classify a flare as severe when there are six or more bloody stools daily together with a systemic marker such as fever above 37.5 °C, tachycardia, anaemia, or raised ESR/CRP; moderate disease has four to six stools with only limited systemic upset. This patient has six stools but no fever above 37.5 °C, no tachycardia, and no transfusion requirement, so the picture fits a moderate flare rather than severe disease.

Question 48Inflammatory Bowel Disease

Which histological feature is most characteristic of ulcerative colitis rather than Crohn's disease?

  1. Transmural inflammation with lymphoid aggregates
  2. Continuous mucosal inflammation confined to the colon with crypt abscesses Correct answer.
  3. Granulomas in the submucosa
  4. Skip lesions with deep fissuring ulcers

Explanation

Ulcerative colitis is a mucosal disease that begins in the rectum and extends proximally in a continuous fashion, with neutrophilic infiltration of crypts producing crypt abscesses and crypt distortion. Transmural inflammation, granulomas, and skip lesions are hallmarks of Crohn's disease.

Question 49Inflammatory Bowel Disease

A 34-year-old woman with Crohn's ileitis is being considered for corticosteroid therapy. Which screening test should be performed before starting treatment because of the risk of reactivation?

  1. HIV antigen/antibody
  2. Helicobacter pylori stool antigen
  3. Hepatitis B surface antigen and core antibody Correct answer.
  4. Hepatitis C antibody

Explanation

Patients with inflammatory bowel disease are frequently exposed to immunosuppression, and hepatitis B reactivation is a well-recognised and preventable complication. Guidelines therefore recommend screening for hepatitis B surface antigen, core antibody, and surface antibody before starting steroids, biologics, or immunomodulators, with antiviral prophylaxis when indicated.

Question 50Inflammatory Bowel Disease

Which finding on colonoscopy most strongly suggests Crohn's disease rather than ulcerative colitis?

  1. Continuous superficial ulceration
  2. Rectal sparing with aphthous ulcers and cobblestoning Correct answer.
  3. Diffuse granular mucosa starting at the rectum
  4. Loss of vascular pattern with friability

Explanation

Crohn's disease typically shows discontinuous involvement with rectal sparing, aphthous ulcers, and a cobblestone appearance produced by intersecting longitudinal and transverse ulcers. Ulcerative colitis instead shows continuous, diffuse mucosal change beginning in the rectum with loss of vascular pattern.