Intramuscular spindle cell lipoma of the thigh: A report of a rare tumor in an extremely rare localization

Abstract

Spindle cell lipoma (SCL) is a benign adipocytic tumor that typically occurs on the neck/upper back and is located in the dermis or subcutis. This case report highlights the intramuscular SCLs clinical presentation, imaging, histomorphologic, and immunohistochemical features. Intramuscular SCL is a very rare condition and, because of its unusual features, it can be misdiagnosed as liposarcoma. The exclusion of malignancy is the primary concern because liposarcomas need more definitive treatment with a wide excision in the surrounding normal tissue. Because of the heterogeneity of the magnetic resonance imaging features of SCL, the definition and cure for this lesion remain challenging.