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Postoperative fever atelectasis — USMLE Step 3 MCQ

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ModerateSurgery (post-operative, follow-up)Postoperative fever atelectasisUSMLE Step 3

A 66-year-old man develops low-grade fever and mild hypoxemia on postoperative day 1 after colectomy. He has shallow breathing due to incisional pain. Lung exam shows bibasilar crackles; wound is clean and urine is clear. Which of the following is the most likely diagnosis?

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Correct answer: C — Postoperative atelectasis

Early postoperative low-grade fever with shallow breathing and bibasilar findings is most consistent with atelectasis.

Reference: American College of Surgeons perioperative care principles