ABS General Surgery common mistakes
ABS General Surgery · Understand the traps and how to avoid them.
When a trauma vignette describes a patient with hypotension and a positive FAST, the candidate selects CT scan of the abdomen/pelvis as the next step rather than immediate operative intervention or the appropriate resuscitation-adjunct pathway.
Candidates pattern-match 'evaluate the abdomen' to CT, forgetting that hemodynamically unstable patients cannot be sent to the scanner and that FAST plus instability mandates laparotomy (or, for the stable-but-borderline patient, the specific adjunct the stem describes).
What to do instead
Before answering any trauma question, classify the patient as stable, borderline, or unstable using the vital signs and response to initial resuscitation, then recall that CT is reserved for stable patients. Write the stability classification at the top of your scratch notes for every trauma stem.
The candidate applies the wrong operation to a given level of colorectal or small bowel pathology, e.g., choosing a low anterior resection for a mid-rectal cancer that requires a different approach, or choosing segmental colectomy when the stem describes a lesion whose lymphatic drainage dictates a more extensive resection.
Rectal and colon cancer surgery is learned as a list of eponymous operations without a mental map tying tumor location and blood supply to the correct resection and anastomosis.
What to do instead
Build a one-page anatomic map: for each colonic segment, note the named artery, the corresponding resection, and the anastomosis. For the rectum, memorize the anterior peritoneal reflection as the dividing landmark and rehearse three cases (upper, mid, low) aloud.
On a biliary question, the candidate treats the finding of gallstone pancreatitis or choledocholithiasis with immediate cholecystectomy in the same admission regardless of severity, or conversely delays cholecystectomy indefinitely after mild disease.
Candidates memorize 'early cholecystectomy is preferred' as a slogan without the qualifier that severe or necrotizing pancreatitis with ongoing organ failure changes timing and may require delayed or step-up management.
What to do instead
Create a severity-stratified table (mild, moderately severe, severe) with the recommended timing of cholecystectomy and ERCP for each row, and practice classifying stems by organ failure and local complications before selecting timing.
The candidate works up a breast complaint in the wrong sequence, e.g., ordering MRI or repeating imaging in a woman with a palpable, imaging-concordant benign mass, or omitting tissue sampling when imaging is suspicious.
The breast algorithm (clinical exam, imaging by age, then core biopsy for suspicious findings) is recalled as an unordered set of tests, and candidates over-value MRI as a screening tool.
What to do instead
Memorize the triple-assessment framework (clinical, imaging, pathology) and the rule that any discordance among the three requires tissue diagnosis. Practice five vignettes classifying each as concordant-benign, discordant, or suspicious and name the next step.
The candidate mis-stratifies a soft tissue lesion by failing to apply the risk factors for necrotizing infection (pain out of proportion, rapid spread, systemic toxicity, skin findings such as bullae or crepitus) and chooses antibiotics alone or simple drainage.
Cellulitis and abscess are far more commonly encountered in study material, so the candidate anchors on the common diagnosis and under-weights the red-flag features of necrotizing soft tissue infection.
What to do instead
Maintain a short red-flag checklist for necrotizing infection and rehearse it on every soft tissue stem; if any red flag is present, the answer is urgent operative debridement, not imaging or antibiotics alone.
The candidate confuses the workup and operative indications for thyroid nodules versus thyroid cancer, e.g., recommending surgery for a benign cytology nodule, or ordering a radioiodine scan as the initial test for a solitary nodule.
The Bethesda cytology categories and their management are memorized as a list without linkage to the decision points (repeat FNA, diagnostic lobectomy, total thyroidectomy), and ultrasound features are under-used.
What to do instead
Draw a decision tree from ultrasound risk features to FNA to each Bethesda category with its management. Add a separate branch for compressive symptoms and for follicular neoplasm, where diagnosis requires surgical pathology.
In critical care stems, the candidate selects the wrong vasopressor or fluid strategy, or fails to recognize when the question is testing source control rather than hemodynamic tuning.
Sepsis bundles are memorized as a bundle rather than as a sequence with a hierarchy, and candidates miss that an undrained source makes further vasopressor escalation the wrong answer.
What to do instead
For each shock vignette, answer three questions in order: is there an uncontrolled source, is the patient fluid-responsive, and what is the first-line vasopressor? Practice stems where the correct answer is 'take the patient to the operating room.'
The candidate stages or chooses adjuvant therapy for a solid tumor without first confirming the node status and margin information in the stem, or applies a staging system to the wrong tumor type.
Candidates jump from tumor size or histology directly to an adjuvant recommendation, skipping the node and margin data that determine stage and therefore the recommendation.
What to do instead
Before answering any oncology question, extract and write down T, N, M, and margin status from the stem. Only then select the stage and the corresponding adjuvant option. If a datum is absent, note that it is the information needed rather than guessing.
The candidate manages a hernia or abdominal wall question by choosing mesh repair in a contaminated field, or by choosing primary tissue repair in a clean elective setting where mesh is indicated.
The mesh-versus-tissue decision is memorized as a preference rather than as a rule driven by contamination and wound class, and the candidate does not classify the field before choosing the repair.
What to do instead
For every hernia stem, first assign a wound class (clean, clean-contaminated, contaminated, dirty). Then apply the rule that permanent synthetic mesh is avoided in contaminated and dirty fields, with the alternatives named for each class.
The candidate answers a question about a specific complication by naming the diagnosis but not the correct next management step, e.g., recognizing an anastomotic leak but choosing observation over reoperation or drainage based on the patient's stability.
Study habits reward recall of diagnoses, so candidates stop reading once they recognize the condition and select an answer that names it or a plausible-sounding test rather than the indicated action.
What to do instead
For every stem, force yourself to answer two separate questions before looking at options: what is the diagnosis, and what is the immediate next step given stability? Practice by covering the options and writing both answers down.