A 82-year-old man consulted our clinic, suffering a fist-sized subcutaneous tumor on his left upper back for 10 years or more.
Excision of this tumor was performed. It was a yellow, soft, encapsulated tumor weighed 100g. Microscopically it consisted of mature lipocytes and nests of fibroblastic spindle cells.
Among these spindle cells, pleomorphic cells and bizarre mononuclear or multinuclear giant cells were observed. Pleomorphic lipoma is a rare and special type of lipoma, sometimes misdiagnosed as a liposarcoma.
This patient had another soft part tumor at his right elbow. It was also extirpated and diagnosed as an angiomyoma.