This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pathology
In PAN, cysts are seen in all except 
Select and explain. 
A. Lung, B. Pancreas, C. Liver, D. Hea
A: Lung
Answer: A: Lung 
Explanation: Polyaeritis nodosa (PAN) is a systemic vasculitis of small or medium-sized muscular aeries that typically involves the renal and visceral vessels and spares the pulmonary circulation. Classic PAN is a segmental transmural necrotizing inflammation of small to medium-sized aeries, often with superimposed thrombosis. Kidney, hea, liver, and gastrointestinal tract vessels are affected in descending order of frequency. Robbins Basic pathology,9th edition,pg no.352