This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood Vessels, Subject name: Pathology
Fish hook pattern of capillaries is seen in 
Select and explain. 
A. Capillary hemangioma, B. Cavernous hemangioma, C. Angiosarcoma, D. Hemangiopericytoma
D: Hemangiopericytoma
Answer: D: Hemangiopericytoma 
Explanation: Ans. (d) Hemangiopericytoma(Ref: Sternberg's Diagnostic Surgical Pathology, 5th Edition, table 511)HemangiopericytomaTumor derived from pericytes Q - perivascular cells that wrap around blood capillariesThese tumors most commonly arise from pelvic retroperitoneum Q or the limbs Q (particularly thighs).Capillaries are arranged in 'fish-hook pattern;' Q seen best with silver stains Q