title: Effect of radiation therapy against intracranial hemangiopericytoma.
abstract: Seven cases of intracranial hemangiopericytoma were studied retrospectively to investigate the efficacy of radiation therapy. Tumor response evaluated by computed tomography and magnetic resonance imaging was obvious after 20-30 Gy irradiation. The total reduction rate was 80-90% and continued as long as 5-7 months after treatment. In five patients receiving radiation therapy before radical removal, the tumors were easily removed without massive hemorrhage. Histological inspection of specimens after irradiation showed a significant disappearance of tumor cells. Pyknosis frequently occurred in endothelial cells, and proliferating vessels with hyalinoid degeneration were also seen. Reticulin fibers between tumor cells were fewer, split, or absent. Preoperative radiation therapy is useful in the treatment of hemangiopericytoma involving considerable surgical risk. Postoperative radiation therapy should be given even if removal is complete.
authors.affiliation: Department of Neurosurgery, Kumamoto University Medical School.
authors.forename: S
authors.initials: S
authors.lastname: Uemura
authors.forename: J
authors.initials: J
authors.lastname: Kuratsu
authors.forename: J
authors.initials: J
authors.lastname: Hamada
authors.forename: S
authors.initials: S
authors.lastname: Yoshioka
authors.forename: M
authors.initials: M
authors.lastname: Kochi
authors.forename: Y
authors.initials: Y
authors.lastname: Ushio
authors.forename: T
authors.initials: T
authors.lastname: Nakahara
authors.forename: K
authors.initials: K
authors.lastname: Kishida
mesh_terms: D000293:Adolescent; D000328:Adult; D001932:Brain Neoplasms / Q000473:pathology / Q000532:radiotherapy* / Q000601:surgery; D002543:Cerebral Hemorrhage / Q000517:prevention & control; D003131:Combined Modality Therapy; D016371:Cranial Irradiation; D004388:Dura Mater / Q000098:blood supply; D005260:Female; D006393:Hemangiopericytoma / Q000473:pathology / Q000532:radiotherapy* / Q000601:surgery; D006801:Humans; D007431:Intraoperative Complications / Q000517:prevention & control; D008297:Male; D008577:Meningeal Neoplasms / Q000473:pathology / Q000532:radiotherapy* / Q000601:surgery; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local; D011182:Postoperative Care; D011300:Preoperative Care; D012189:Retrospective Studies; D016896:Treatment Outcome