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Incidentally-found 10mm, left MCA aneurysm in a 46 year-old female (patient 17) is irregular with multiple blebs (A) and stains positive for MPO (B, 20×). A 29 year-old female (patient 16) with incidentally found right MCA and PComm artery aneurysms on CT-angiography (C). The 14mm MCA-aneurysm stains negative for MPO (D).
