[Rare lesions of the internal carotid arteries].

The rare lesions of internal carotid arteries are varied in both their appearance and their cause. Schematically, in addition to congenital anomalies, of which fibromuscular dysplasia is no doubt the most frequent, should be noted lesions of inflammatory, infectious, traumatic and iatrogenic origin. The fact that the relationship between some of these lesions and cerebral vascular accidents is not clearly established, leads to diagnostic and therapeutic problems which are difficult to resolve.