This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
"Pile of plates" appearance on angiography suggests diagnosis of 
Select and explain. 
A. Atherosclerosis, B. Fibromuscular Dysplasia, C. Takayasu's Disease, D. Moya Moya disease
B: Fibromuscular Dysplasia
Answer: B: Fibromuscular Dysplasia 
Explanation: Angiography: "string of beads"/"Pile of plates" appearance of FMD is classically seen on angiography. Fibromuscular dysplasia most commonly causes small stenoses along a vessel with intervening areas of dilatation (small aneurysms), creating a "string of beads" appearance. Less commonly the stenosis has a smooth tapered appearance. Fibromuscular dysplasia also weakens the vessel wall which predisposes to dissection ref Robbins 9/e pg 678