Fibromuscular dysplasia, characterized by a periumbilical bruit, typically shows what on angiography?

Fibromuscular dysplasia (FMD) is a vascular disorder that primarily affects the renal arteries and is often seen in young women. On angiography, the hallmark finding for FMD is the "beaded" appearance of affected arteries. This beading results from alternating stenosis (narrowing) and aneurysm formation along the arterial wall.

The beaded pattern arises due to the irregularity of the arterial wall architecture, which causes focal areas of stenosis and successive dilations. This characteristic finding is crucial for diagnosis and distinguishes it from other vascular conditions, where the appearance can be continuous or normal.

Additionally, recognizing the beaded pattern on angiography can direct appropriate management, as fibromuscular dysplasia often responds well to catheter-based interventions or medical management. This clear, diagnostic feature making FMD visually identifiable on imaging supports the conclusion that beaded stenosis of the renal artery is the correct answer.