Anatomical variants · USMLE Step 1

An abdominal CT reveals a retroaortic left renal vein. This variant predisposes to which condition?

  1. Nutcracker syndrome
  2. Thoracic outlet syndrome
  3. May-Thurner syndrome
  4. Pelvic congestion syndrome
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Correct answer: Nutcracker syndrome

A retroaortic left renal vein may be compressed between the aorta and vertebral column, causing nutcracker-like symptoms. Awareness is crucial for renal surgery.

Difficulty: Medium Question 10 of 20

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