When the fat is missing: a fat-free spindle cell lipoma in a young woman

Dear Editor, Spindle cell lipoma (SCL) is a benign adipocytic neoplasm first characterized by Enzinger and Harvey, classically arising in the posterior neck, shoulder, and upper back of middle-aged to older men. Histologically, it is defined by a variable admixture of mature adipocytes, bland spindle cells, rope-like collagen, and myxoid matrix. The adipocytic component, however, may be minimal or entirely absent, creating a diagnostically deceptive low-fat or fat-free phenotype. [...]