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Deep incisional infection — USMLE Step 3 MCQ

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ModerateSurgery (post-operative, follow-up)Deep incisional infectionUSMLE Step 3

A 61-year-old man is seen 12 days after colectomy with fever and increasing wound pain. The incision is erythematous, and gentle probing releases purulent fluid from deep tissue. Which of the following is the most likely diagnosis?

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Correct answer: C — Deep incisional surgical site infection

Purulent drainage from deep tissues after surgery indicates deep incisional surgical site infection.

Reference: CDC surgical site infection definitions