Abstract
We present 2 cases of cyst formation after gamma knife radiosurgery for intracerebral arteriovenous malformations (AVM). In both cases complete obliteration of AVM was confirmed by angiography within 2 years after treatment. However, about 5 and 3.5 years after treatment they had a large cyst with neurological signs and symptoms. Operations were performed and the pathology of the cyst wall was investigated in both of cases. The pathological findings showed gliosis without malignant brain change.
These two cases are the first reported in which the pathology of cyst wall was studied after radiosurgery.
To investigate side effects of radiosurgery, a long follow-up will be needed after complete obliteration of AVM.
