Anatomical variants · USMLE Step 1

A patient has a tracheal bronchus arising directly from the trachea. This variant is most likely to affect which lung region?

  1. Right upper lobe
  2. Right middle lobe
  3. Left upper lobe
  4. Left lower lobe
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Correct answer: Right upper lobe

A tracheal bronchus typically supplies the right upper lobe. It can predispose to recurrent infections in that region.

Difficulty: Medium Question 11 of 20

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