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Development and natural course of lateral posterior choroidal artery aneurysms arising from fragile choroidal collaterals in moyamoya disease: illustrative cases

Tomoaki Suzuki, Hitoshi Hasegawa, Kouichirou Okamoto, Kazuhiro Ando, Kohei Shibuya, Haruhiko Takahashi, Shoji Saito, Makoto Oishi, and Yukihiko Fujii

–E ). Single-photon emission computed tomography (CT) with N-isopropyl [ 123 I]-p-iodoamphetamine evidenced the impaired cerebrovascular reactivity (CVR) in the left hemisphere ( Fig. 2F ). Bypass surgery was performed for the right hemisphere to prevent rebleeding (17 months after hemorrhage). No surgical intervention was performed for the left hemisphere while she was hospitalized because it was asymptomatic. FIG. 1. MRI shows a small aneurysm formation in the left ventricle wall of the distal lateral choroidal artery ( white arrows ) that was suspected to be associated