[Spindle cell lipoma].

A 74-year-old patient presenting with a subcutaneous tumor on his right upper arm is reported. Clinical examination led to the suspicion of a lipoma, cyst, and subcutaneous metastasis. Microscopical and immunohistological investigations allowed diagnosis of the tumor as a spindle cell lipoma. The most important aspect of differential diagnosis of this benign tumor is the exclusion of liposarcoma.