Systemic Pathology by Organ · USMLE Step 1

Which of the following describes a saccular true aneurysm?

  1. Fusiform dilation of the entire circumference
  2. Localized outpouching of all three wall layers
  3. False aneurysm with only a fibrous wall
  4. Segmental dissection between intima and media
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Correct answer: Localized outpouching of all three wall layers

A true saccular aneurysm is a localized outpouching of the vessel wall that involves all three layers — intima, media, and adventitia.

Difficulty: Medium Question 16 of 19

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