Aneurysm in the skin: arterial fibromuscular dysplasia.

We describe a pulsatile aneurysm in the skin of 16-year-old boy that was found to be a sign of a systemic vascular disease, that is, arterial fibromuscular dysplasia. The patient had aneurysms in the renal, cerebral, coronary, and other arteries; he developed renovascular hypertension and had a cerebrovascular accident and acute myocardial infarction at 17 years of age. This disease has not been previously reported in the dermatologic literature.