This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
All of the following are pathologic features of brain in AIDS, EXCEPT: 
Select and explain. 
A. Perivascular giant cell invasion, B. Microglial nodules, C. Vasculitis, D. Temporal lobe infarction
C: Vasculitis
Answer: C: Vasculitis 
Explanation: Pathologic features of brain in AIDS includes: Gross: Encephalitis: frontal /temporal coical atrophy Histology: Meningitis with mild lymphocytic infiltrates and scanty perivascular inflammation Features of giant cell (HIV) encephalitis are: Presence of microglial nodules Pericapillary aggregates of multinucleated giant cells having generous or scanty neoplasm Perivascular lymphocytic cuffing In leukoencephalopathy: there is diffuse diffuse demyelination and infiltration of macrophages and multinucleated giant cells. Ref: Neuropathology,A Volume in the High Yield Pathology Series (Expe Consult ... edited by Anthony T. Yachnis page 235.