[Gamma knife radiosurgery for temporal bone chondroblastoma: case report].

A case with chondroblastoma arising from the right temporal bone was reported. A 52-year-old woman demonstrated residual tumor growth after surgical excision. The patient presented continuous right temporalgia and right facial twitch while opening her mouth. The tumor was an expansile mass (tumor volume: 12.8 cm3) and showed homogeneous hypo-intensity on T1 and T2-weighted images, but little contrast enhancement. The patient underwent gamma knife radiosurgery (GKR: marginal dose: 12 Gy, maximum dose: 24 Gy). One month later, her symptoms improved completely. The size of the tumor was reduced to 6.4 cm3 twenty months after GKR. The patient has been free of recurrence and side effects for four years since GKR. GKR may be useful to control residual chondroblastoma of the skull after surgery.