TRAUMATIC PSEUDOANEURYSM - A POSSIBLE EARLY LESION IN THE SPECTRUM OFEPITHELIOID HEMANGIOMA ANGIOLYMPHOID HYPERPLASIA WITH EOSINOPHILIA

We describe a vascular lesion that develops secondary to trauma (pseud otraumatic aneurysm) and study its relation to epithelioid hemangioma (EH)/angiolymphoid hyperplasia with eosinophilia (ALHE). Four lesions are described, all with a distinct history of trauma to the site from which they arose. They presented with masses in the subcutaneous tissu e of the head. They were studied by immunohistochemical methods to ide ntify their component cells. The lesions all demonstrated marked thick ening of the wall of small and medium-sized arteries, with capillary v ascular proliferations. One lesion demonstrated increased eosinophils. Myxoid changes were noted in all lesions. We hypothesize that these l esions may represent an early form of EH/ALHE.