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[Stereotactic radiosurgery with adjusted linear accelerator for cerebral arteriovenous malformations: preliminary
J G Wolbers1, H C Mol, J H Kralendonk
1Afd. Neurochirurgie, Academisch Ziekenhuis Vrije Universiteit, Amsterdam.
Objective:
To assess the effects of stereotactic radiosurgery of a cerebral arteriovenous malformation (AVM).
Design:
Prospective.
Method:
In November 1991-December 1995 linear acceleration radiosurgery was performed on 29 patients for their 30 cerebral AVMs in the University Hospital Vrije Universiteit, Amsterdam, the Netherlands. There were 15 females and 14 males with a mean age of 37.1 years (range: 13-58). Generally one isocentre was used and 15 Gy was given to the margins of the AVM at the 80% isodose. The mean target volume was 2.4 ml (range; 0.5-8.2). After 6 months, one year and thereafter every year, neurological and MRI-controls took place, in the outpatient ward. Angiography was performed after an average of 35 months (range: 24-70) to check if the AVM had obliterated.
Results:
Angiographic post-treatment results were available in 27 patients and MRI information in one. Angiographic obliteration occurred in 20 patients (71%). No permanent radiation-induced neurological deficit was seen, nor did any hemorrhage occur during the interval between irradiation and obliteration.