The solitary fibrous tumor (SFT) in its lipomatous variant is very rare, with only a few cases described in the literature. It is a myofibroblastic mesenchymal tumor with intermediate behavior. We report the case of a 33-year-old patient with no notable pathological history, admitted following the incidental discovery of a dorsal mass involving the soft tissues, whose radiological examination suggested a schwannoma. The patient underwent a surgical biopsy showing a tumoral proliferation composed of spindle cells within mature adipose tissue. Immunohistochemical studies were necessary to rule out differential diagnoses before establishing the final diagnosis.
Bakhti et al. (2026) studied this question.