We describe a case of 58-year-old man who presented with a right internal carotid artery-anterior choroidal artery aneurysm. The patient hoped for the operation of clipping the unruptured aneurysm. His profound ischemia due to temporary occlusion of the anterior choroidal artery was clearly detected during surgery for the internal carotid artery-anterior choroidal artery aneurysm using motor-evoked potential (MEP). Reopening the anterior choroidal artery immediately recovered the MEP amplitude. Because the MEP would have disappeared due to clipping, only wrapping and coating was performed. The normal wrapping and coating material, Bemsheet ® , was used. Therefore, the postoperative course was good, and he left the hospital one week after the operation. However, about two months after the operation, he complained of a fever and staggering. A cerebral infarction in the anterior choroidal artery area was detected using MR imaging, and a right internal carotid artery stricture was detected using MRA. After he was hospitalized, the edema around the right basal ganglia infarction increased, and he developed left hemiparesis, sensory neglect, and disorientation. Vasculitis due to the Bemsheet ® was suspected. A steroid was administered. The fever was alleviated one week after the administration of the steroid, and the inflammation was improved. However, he did not recover from the left hemiparesis, and was transferred to a rehabilitation hospital. This case suggests that Bemsheet ® used when operating can cause an arterial occlusive lesion that is observed following aneurysm surgery, and a safer wrapping and coating material is necessary in the future.
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