[Cerebral infarction in a boy with subdural abscess].

A 13-year-old boy was reported with a subdural abscess in the left anterior cranial fossa and an infarction in the lesion supplied by the left middle cerebral artery. Cranial computed tomography revealed a gradual increase of a low density area with surrounding capsule formation, and later another low density area which indicated in occlusion of the left middle cerebral artery. Cerebral angiography disclosed a stenosis at the trifurcated portion of the left internal carotid artery near the abscess. These findings suggested the occurrence of infarction due to angiitis of the internal carotid artery.