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Figure 7b. Aneurysm and arteriovenous malformation in a 60-year-old woman with subarachnoid hemorrhage (Hunt and Hess grade III). (a) Coronal and (b) sagittal MIP images from CT angiography show bilobed aneurysm (white arrows) in the anterior communicating artery, aneurysm (white arrowheads) in the left posterior communicating artery, large left frontal arteriovenous malformation (black arrows), and prominently enlarged anterior cerebral arteries (black arrowheads). Attenuation in the vertex is decreased because of an inadvertent delay before scanning of this section. The tubular high-attenuating structure is a ventriculostomy catheter. (c) Lateral projection image from DSA with left common carotid artery injection and (d) oblique projection image from DSA with right common carotid artery injection also show the aneurysms in the anterior communicating artery (white arrow) and the posterior communicating artery (white arrowhead), enlarged feeding vessels (black arrowheads), and arteriovenous malformation (black arrows).
