title: Subarachnoid hemorrhage caused by pilocytic astrocytoma--case report.
abstract: A 20-year-old woman presented with subarachnoid hemorrhage (SAH) in the frontal interhemispheric fissure, and a cystic lesion in the left frontal lobe. Cerebral angiography demonstrated no aneurysm or vascular abnormalities. T(1)-weighted magnetic resonance imaging with contrast medium revealed an enhanced lesion along the falx. The lesion and cyst were removed, and histological examination revealed a pilocytic astrocytoma. Spontaneous intracranial hemorrhage from pilocytic astrocytoma is rare, with only 15 reported cases mostly involving intratumoral hemorrhage in the parenchyma of hypothalamic and cerebellar tumors. SAH caused by cerebral hemisphere pilocytic astrocytoma is extremely rare. This case suggests that interhemispheric fissure SAH, not associated with aneurysm or abnormal vascularity, could originate from small, low-grade glioma in the superficial cerebral hemisphere.
authors.affiliation: Department of Neurosurgery, Tokyo Rosai Hospital, Tokyo, Japan. kkato@tokyoh.rofuku.go.jp
authors.forename: Koichi
authors.initials: K
authors.lastname: Kato
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Moteki
authors.forename: Masanori
authors.initials: M
authors.lastname: Nakagawa
authors.forename: Shigeru
authors.initials: S
authors.lastname: Kadoyama
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ujiie
mesh_terms: D001254:Astrocytoma / Q000150:complications* / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D001932:Brain Neoplasms / Q000150:complications* / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D002533:Cerebral Angiography; D003937:Diagnosis, Differential; D005260:Female; D005625:Frontal Lobe / Q000473:pathology / Q000601:surgery; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D013345:Subarachnoid Hemorrhage / Q000175:diagnosis* / Q000209:etiology* / Q000473:pathology / Q000601:surgery; D014057:Tomography, X-Ray Computed; D055815:Young Adult