title: Delayed bleeding after gamma knife surgery for meningioma.
abstract: We report the occurrence of haemorrhage in a meningioma after gamma knife surgery.A 52-year-old woman had undergone gamma knife radiosurgery for a growing meningioma in the left tentorial hiatus three years earlier (A radiation dose of 15 Gy was administered to the margin, with a maximum dose of 30 Gy, Fig. 1a). The size of the mass decreased steadily, and central lucency was seen in the follow-up magnetic resonance images, a usual finding seen after gamma knife surgery (MRI, Fig. 1b). However, a MRI taken at the 30-month follow-up showed the tumour to be swollen, and peritumoural oedema had increased (Fig. 1c). Three years later, apoplectic symptoms occurred, and computed tomography revealed a peritumoural haemorrhage, with oedema (Fig. 1d). An emergency craniotomy was carried out, and the biopsy showed a transitional type of meningioma, with vasculopathy and necrosis. After operation she had a right hemiparesis and a visual defect.
authors.affiliation: Department of Neurosurgery, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: C H
authors.initials: CH
authors.lastname: Kim
authors.forename: D G
authors.initials: DG
authors.lastname: Kim
authors.forename: S H
authors.initials: SH
authors.lastname: Paek
authors.forename: H-T
authors.initials: HT
authors.lastname: Chung
authors.forename: Y L
authors.initials: YL
authors.lastname: Choi
authors.forename: J G
authors.initials: JG
authors.lastname: Chi
mesh_terms: D005260:Female; D006801:Humans; D008577:Meningeal Neoplasms / Q000601:surgery*; D008579:Meningioma / Q000601:surgery*; D008875:Middle Aged; D019106:Postoperative Hemorrhage / Q000209:etiology*; D016634:Radiosurgery / Q000009:adverse effects*; D013997:Time Factors