Right Lower Quadrant Pain in a Young Woman
A 22-year-old woman presents with 18 hours of periumbilical pain that migrated to the right lower quadrant, now constant and sharp. She has vomited twice and has no appetite. Temperature 38.1 C, pulse 104/min, BP 110/70 mmHg. On examination there is guarding and rebound tenderness maximal at McBurney's point. Pelvic examination shows no cervical motion tenderness; pregnancy test is negative. White cell count 14,500/microlitre with neutrophilia. Urinalysis shows 5-10 white cells per high-power field without nitrites. An abdominal ultrasound is reported as 'no free fluid, appendix not visualized.' The surgical resident proposes discharge with oral antibiotics for 'urinary tract infection.'
1. How do you weigh the ultrasound report against the clinical picture? What is the most likely diagnosis and why?
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The clinical picture is the dominant evidence. Migratory pain from periumbilical to right lower quadrant, anorexia, vomiting, low-grade fever, tachycardia, localized guarding and rebound at McBurney's point, and a neutrophilic leukocytosis are the classic constellation for acute appendicitis.
The ultrasound is not reassuring - 'appendix not visualized' is a non-diagnostic study, not a negative one. A non-visualized appendix in a patient with this presentation does not exclude appendicitis; it means the test failed to answer the question. The mild pyuria without nitrites is explainable by adjacent inflammation irritating the ureter/bladder, not by UTI.
Discharging this patient on oral antibiotics for UTI would risk perforation. The correct move is to escalate imaging (CT abdomen/pelvis, or surgical consultation for serial examination) rather than accept a non-diagnostic test.
2. If CT confirms appendicitis without perforation, what are the management options and how would you choose?
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Two broad options:
- Appendectomy (laparoscopic where available) - definitive, removes the risk of recurrence and perforation, and is standard of care in most settings.
- Antibiotic-first (conservative) management - reasonable in selected uncomplicated cases, but carries a meaningful recurrence rate over the following year and requires reliable follow-up and the ability to return urgently.
In this patient (young, uncomplicated, reliable, in a setting with surgical capacity), appendectomy is the safer default. Antibiotic-first would be a defensible choice only if surgery were unavailable or the patient preferred it after full counseling about recurrence risk. Either way, she needs admission and IV antibiotics while awaiting the operating room - not discharge.
3. Two days after an uneventful appendectomy she develops fever 38.9 C, tachycardia, and diffuse abdominal tenderness with absent bowel sounds. What is your differential and first steps?
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Postoperative fever with diffuse peritonitis and ileus raises:
- Intra-abdominal abscess or anastomotic/stump leak (most concerning)
- Wound infection (usually more localized, but can coexist)
- Atelectasis/pneumonia
- Urinary tract infection (with a catheter)
- Deep vein thrombosis/pulmonary embolism (less likely to cause peritonitis)
First steps: full reassessment including wound inspection, cultures (blood, urine), chest imaging, and contrast-enhanced CT of the abdomen and pelvis to look for abscess or leak. Start broad-spectrum IV antibiotics covering gram-negatives and anaerobes, resuscitate, and involve surgery immediately. Do not attribute this to 'postoperative ileus' alone - peritonitis plus fever demands a source hunt.