title: Pilocytic astrocytoma of the velum interpositum.
abstract: A 72-year-old male presented with a pilocytic astrocytoma in the velum interpositum manifesting as a 5-day history of dizziness attacks and unstable gait. Computed tomography and T1-weighted magnetic resonance imaging with gadolinium enhancement demonstrated a small, homogeneously enhanced mass in the velum interpositum. The tumor was removed subtotally, and the structure of the splenium was intact. The histological diagnosis was pilocytic astrocytoma. The MIB-1 growth fraction was 5%. The tumor may have originated from the splenium or the thalamus. The aggressive histology indicates the need for close neuroimaging follow-up.
authors.affiliation: Department of Neurosurgery, Yamaguchi University School of Medicine, Ube.
authors.forename: M
authors.initials: M
authors.lastname: Ideguchi
authors.forename: T
authors.initials: T
authors.lastname: Nishizaki
authors.forename: K
authors.initials: K
authors.lastname: Harada
authors.forename: T
authors.initials: T
authors.lastname: Kwak
authors.forename: T
authors.initials: T
authors.lastname: Murakami
authors.forename: H
authors.initials: H
authors.lastname: Ito
mesh_terms: D000368:Aged; D034961:Antigens, Nuclear; D001254:Astrocytoma / Q000175:diagnosis / Q000473:pathology / Q000601:surgery*; D014408:Biomarkers, Tumor / Q000032:analysis; D001932:Brain Neoplasms / Q000175:diagnosis / Q000473:pathology / Q000601:surgery*; D003337:Corpus Callosum / Q000473:pathology / Q000601:surgery; D006801:Humans; D019394:Ki-67 Antigen; D008279:Magnetic Resonance Imaging; D008297:Male; D009687:Nuclear Proteins / Q000032:analysis; D013786:Thalamic Diseases / Q000175:diagnosis / Q000473:pathology / Q000601:surgery*; D014057:Tomography, X-Ray Computed
chemical_list: D034961:Antigens, Nuclear; D014408:Biomarkers, Tumor; D019394:Ki-67 Antigen; D009687:Nuclear Proteins