title: Hemorrhagic onset of pilocytic astrocytoma and pilomyxoid astrocytoma.
abstract: The incidence of hemorrhagic onset in pilocytic astrocytoma and pilomyxoid astrocytoma, and the clinical and histological characteristics, were compared to other types of neuroepithelial tumors or nonhemorrhagic pilocytic astrocytoma by retrospective review of 445 consecutive neuroepithelial tumors treated at our institute. Hemorrhagic onset was observed in 4 of 35 (11.4%) patients with pilocytic astrocytoma and pilomyxoid astrocytoma, with higher incidence than in glioblastoma (3.9%), anaplastic oligodendroglioma (7.7%), and anaplastic ependymoma (7.1%). The hemorrhagic onset occurred in 2 patients with sporadic pilocytic astrocytoma, 1 with pilocytic astrocytoma associated with neurofibromatosis type 1, and 1 with pilomyxoid astrocytoma. There was no correlation between hemorrhagic onset and clinical features, including age, sex, tumor location, proliferative activity, or microvascular proliferation. Hemorrhagic onset of pilocytic astrocytoma and pilomyxoid astrocytoma is not as uncommon as was previously thought, so pilocytic astrocytoma or pilomyxoid astrocytoma should be considered in the differential diagnosis of patients with brain tumors manifesting as hemorrhagic onset.
authors.affiliation: Department of Neurosurgery, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8574, Japan.
authors.forename: Ichiyo
authors.initials: I
authors.lastname: Shibahara
authors.forename: Masayuki
authors.initials: M
authors.lastname: Kanamori
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Kumabe
authors.forename: Hidenori
authors.initials: H
authors.lastname: Endo
authors.forename: Yukihiko
authors.initials: Y
authors.lastname: Sonoda
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Ogawa
authors.forename: Mika
authors.initials: M
authors.lastname: Watanabe
authors.forename: Teiji
authors.initials: T
authors.lastname: Tominaga
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001254:Astrocytoma / Q000150:complications* / Q000453:epidemiology / Q000473:pathology*; D001921:Brain / Q000473:pathology; D001932:Brain Neoplasms / Q000150:complications* / Q000453:epidemiology / Q000473:pathology*; D002196:Capillaries / Q000473:pathology; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D020300:Intracranial Hemorrhages / Q000453:epidemiology / Q000209:etiology* / Q000473:pathology*; D019394:Ki-67 Antigen / Q000378:metabolism; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009456:Neurofibromatosis 1 / Q000150:complications / Q000473:pathology; D010243:Paralysis / Q000209:etiology; D014057:Tomography, X-Ray Computed; D055815:Young Adult
chemical_list: D019394:Ki-67 Antigen