Arteriovenous malformations (AVMs) are congenital lesions formed by a network of dysplastic vessels. CASE REPORT: We report a case of a 63 years old man, admitted with seizures and headache. Imaging findings, angio-CT, angio-MR and angiography revealed a partially thombosed right parasagittal frontal AVM, with fully thrombosed associated flow-related aneurysm on the main arterial feeder. The patient underwent surgery and we performed total resection of the AVM. The particularity of this case is the rare possibility of outcome with regression of the vascular malformation. CONCLUSIONS: Brain AVMs are evolutive lesions. Regression, through progressive thrombosis of the nidus is a rare possible outcome in brain AVMs. In thrombosed AVMs angiography is not reliable, and angio-CT and/or angio-MR are mandatory, in order to correctly evaluate nidus size and associated lesions. Symptomatic AVMs require surgery. Partial thombosed AVMs can be safely resected
