Adventitial melanocytosis ("blue nevus") of the aorta.

Benign stromal proliferations of pigmented melanocytes or blue nevi have been documented in several extracutaneous sites, such as uterine cervix, prostate, and lymph nodes. We report a 54-year-old male with melanocytic pigmentation of the adventitia of the ascending aorta. This would appear to be the first documentation of stromal melanocytosis (or "blue nevus") of the aorta.