Figure 1

Findings of brain and spinal MRI, and angiography after the first admission for aneurysm coiling and after aneurysm coiling. No lesions were observed with axial slices of a fluid-attenuated inversion recovery (FLAIR) image (A-D). Brain MRA showed a 4 × 4 mm unruptured cerebral aneurysm (CAn) in the basilar artery located at the origin of the right superior cerebellar artery (E, arrowhead). Precoiling posterior angiography showed an unruptured CAn (F) and postcoiling angiography showed the occlusion of CAn and the patency of all vessels (G). After aneurysm coiling, left cerebellar, bilateral occipitotemporal, and left parietoccipital lobe lesions were observed with the axial slices of the FLAIR image (L-O, arrowheads) without a positive signal of the diffusion-weighted image (H-K, arrowheads) at 1 month after coiling, which expanded markedly in size at 2 months after coiling (P-S, arrowheads).