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FIG 2. Case 3, a 60-year-old man with an unruptured internal carotid-posterior communicating artery aneurysm.
A, Operative photograph (OP), caudal view, shows the aneurysm (AN). C2 indicates the second portion of the internal carotid artery; M1, first segment of the middle cerebral artery; ON, optic nerve.
B, Digital subtraction angiogram (DSA) is in right lateral projection.
C, Serial source images of MR cisternography (MRC), superoinferior projection, show aneurysmal complex and perianeurysmal structures. BA indicates the basilar artery; TL, temporal lobe; M1, first segment of the middle cerebral artery; ON, optic nerve; PS, pituitary stalk; CN III, oculomotor nerve; AN, aneurysm; C2, second segment of the internal carotid artery; PCP, posterior clinoid process.
D, 3D MRC, right posterolateral projection, is viewed from the basal cistern. CN III indicates oculomotor nerve; TL, temporal lobe; AN, aneurysm; C2, second segment of the internal carotid artery; PCP, posterior clinoid process.
E, 3D MR angiogram (MRA), coordinated projection as to the 3D MRC in D, shows the aneurysm with a bleb (arrowhead).
F, Fusion image of the 3D MRC and MRA shows spatial relationship of the dome bleb to the adjacent oculomotor nerve.
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