Abstract
To report two cases of spontaneous occlusion of residual malformations that had previously been embolized and to analyze their probable causes. Retrospective review of patients with embolized arteriovenous malformations (AVMs) between January 1999 and August 2005 in our institution and analysis of two cases of occlusion in residual AVMs. Two cases of AVMs that received endovascular treatment and had post-embolization residual nidus malformation, which in later angiographic controls showed a complete disappearance of the lesions without other treatment. The spontaneous occlusion of residual arteriovenous malformations is an infrequent occurrence. Several related mechanisms are discussed.
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