Abstract
We treated 48 cerebral vascular malformations, including 26 arteriovenous malformations (AVMs) in 26 patients, and 22 cavernous malformations in 5 patients, by stereotactic radiosurgery. In all patients, follow-up MRI was performed (mean follow-up interval, 7.1 months). Complete regression of the nidus was found in 3 AVMs. Complete resorption of subacute haemorrhage was found in 1 cavernous malformation. Partial regression was found in 15 AVMs and 3 cavernous malformations. Radiation-induced signal changes developed in 14 AVMs and 4 cavernous malformations. Increased signal intensity of an extensive area of the white matter (grade III) was demonstrated in 4 AVMs and 4 cavernous malformations. Perifocal enhancement was demonstrated in 1 AVM and 3 cavernous malformations. There were 15 AVMs more than 2 cm in diameter, and 3 of these demonstrated grade III radiation-induced change, while 1 showed perifocal enhancement. Grade III changes were demonstrated in all 3 cavernous malformations more than 2 cm in diameter.
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