[Report of two patients with fibromuscular dysplasia of the internal carotid artery (author's transl)].

Two patients with fibromuscular dysplasia of the internal carotid artery have been studied. Our patients' clinical histories suggest that cerebral symptoms were due either to episodic arterial embolization or progressive arterial occlusion. The radiological features were characteristic. Surgery of cervical vessels was performed with benefit in both cases. Histopathology of the carotid arteries showed segmental lesions with alternating marked thickening and thinning of the media and irregular hyperplasia of the intima.