Aneurysmal Dermatofibroma of the Earlobe: A Case Report

Abstract

Aneurysmal dermatofibroma is a rare variant of cutaneous fibrous histiocytoma (dermatofibroma) thought to be secondary to slow extravasation of blood into the lesion. The resulting entities have different clinical and pathological presentations that can lead to diagnostic confusion with other types of skin lesions. We discuss the defining features of aneurysmal dermatofibroma to outline important considerations in the differential to avoid potential misdiagnosis. While dermatofibromas in general tend to follow a benign course, aneurismal dermatofibromas represent a subset with both a higher recurrence rate and a rare risk of metastasis. With these in consideration, proper diagnosis and excision of the lesion should be considered. Although aneurismal dermatofibromas often present on the extremities, few have been reported to appear on other locations of the body. This case report describes an elderly man with an aneurysmal dermatofibroma occurring on the earlobe, a site of occurrence that has only rarely been reported prior.