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FIG 1. 28-year-old man with acute loss of consciousness.
A, Axial T2-weighted MR image shows the area of infarction in the anterior aspect of the left thalamus and adjacent internal capsule.
B, Axial T2-weighted MR image shows fusiform dilation of the posterior communicating artery.
C, Axial T1-weighted MR image obtained at the same level as in B shows hyperattenuated signal intensity in the walls of the aneurysm probably due to intramural thrombus.
D, Selective left internal carotid artery digital subtraction arteriogram confirms the presence of a dissecting aneurysm of the posterior communicating artery.
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