34-year-old man who presented to the emergency department with headache.A, Nonenhanced CT scan of the head demonstrates a focal hyperattenuation (arrow)

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Presentation transcript:

34-year-old man who presented to the emergency department with headache.A, Nonenhanced CT scan of the head demonstrates a focal hyperattenuation (arrow) suggestive of subarachnoid hemorrhage in the interpeduncular cistern.B, CT angiographic source image dem... 34-year-old man who presented to the emergency department with headache.A, Nonenhanced CT scan of the head demonstrates a focal hyperattenuation (arrow) suggestive of subarachnoid hemorrhage in the interpeduncular cistern.B, CT angiographic source image demonstrates a large anterior PMV (arrow) in the interpeduncular fossa posterior to basilar artery (arrowhead).C–E, Sagittal slab MIP image (C) and 3D volume-rendered craniocaudal (D) and posteroanterior (E) views demonstrate the large anterior PMV (white arrowhead) posterior to the basilar artery (black arrowhead) and the interpeduncular veins (black arrows). A indicates anterior; P, posterior; S, superior; I, inferior. Mehmet Teksam et al. AJNR Am J Neuroradiol 2003;24:1598-1601 ©2003 by American Society of Neuroradiology