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Fibromuscular dysplasia of the internal carotid artery.

An observation on symptomatic fibromuscular dysplasia of the internal carotid artery, surgically treated by graduated internal dilatation is presented. Fibromuscular dysplasia is a segmental, nonatheromatous disease of small to medium-sized arteries, affecting mainly renal arteries. Involvement of the internal carotid artery is often an incidental angiographic finding in asymptomatic patients, but can be associated with specific neurologic symptoms requiring surgical treatment. The histopathologic character, the pathogenesis, the clinical manifestation, the diagnosis and the therapeutic possibilities of this affection are discussed.