Peripheral artery aneurysm is characterized by what property?

• A. It ruptures easily
• B. It forms clots that can block blood flow to a limb or the brain
• C. It has no risk of clot formation
• D. It occurs only in the brain

Answer: (B)

The main idea is that a peripheral artery aneurysm creates abnormal, dilated flow that promotes clot formation. The widened, sluggish segment of the artery tends to develop thrombi due to stasis and turbulent flow. These clots can dislodge and travel downstream, blocking blood flow to a limb or traveling to the brain and causing ischemia. That tendency to form clots that can embolize is the defining property.

Rupture can occur, and distal embolization is a key clinical risk, but the crucial concept here is the tendency for thrombosis with potential downstream consequences. Peripheral aneurysms aren’t limited to the brain, so they aren’t restricted to cerebral vessels.