Abstract
Abstract Based upon arteriographic studies of 25 spinal cord arteriovenous malformations, the concept is proposed that most angiomas have a nidus or focus of abnormal vessels that constitutes the heart of the lesion. The nidus can be distinguished from the secondarily enlarged draining veins only by arteriography. The convergent point of multiple arterial feeders, the divergent point of draining veins, and the change in vascular calibre are the three angiographic signs localizing the nidus. In ten out of 12 spinal cord angiomas with multiple feeders, a nidus was clearly demonstrated. In 13 malformations having a single feeding artery, a nidus was recognized in six. In seven, the malformation consisted of a single meandering vascular channel without a typical glomus. Excision of the nidus is proposed as an alternate approach to complete surgical stripping.
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