Abstract
We evaluated surgical treatment for angiomatous lesion developing after gamma knife radiosurgery (GKS) for arteriovenous malformation (AVM) by retrospectively examining the medical records of 3 female patients aged 20 to 52 years (mean 31.3 years) at the time of GKS, who developed symptomatic angiomatous lesion associated with severe surrounding brain edema 9-11 years after GKS. Angiomatous lesions were dark red and well demarcated from the brain. Bleeding during resection was slight and easily controlled, but the angiomatous lesions were very fragile and difficult to remove en bloc. Therefore, total removal is not easy in the case of angiomatous lesions in deep locations such as interhemispheric sites with lateral extension. Angiomatous lesion developing after GKS for AVM is rare but becomes progressively symptomatic with severe surrounding brain edema, and the only treatment is surgery.
