Abstract
Cutaneous leiomyosarcoma is a rare sarcoma of the skin that is divided into dermal and subcutaneous types. Here, we report a case of a man in his 60s who presented with a tumor on his left greater trochanter that had grown slowly over 13 years and rapidly increased in size during the past year. Physical examination revealed a dark red, elevated, partially crusted, firm tumor about 3 cm in diameter on the left greater trochanter. The tumor was contiguous with a firm subcutaneous tumor about 6 cm in diameter. Histological examination of a surgical specimen revealed proliferating neoplastic cells with a fascicular arrangement from the dermis to the subcutaneous tissue, and the tumor border was clear. The neoplastic cells were positive for α-smooth muscle actin, desmin, and calponin. Based on the clinical and pathological findings, a diagnosis of cutaneous leiomyosarcoma was made. As there have been some reports that cases of cutaneous leiomyosarcoma infiltrating to the subcutis have the potential for recurrence and metastasis, we have to follow up this case carefully.
