Lipomatous (Fat-Forming) Solitary Fibrous Tumor of the Breast: A Case Report of an Uncommon Variant of a Rare Clinical Entity.

Solitary fibrous tumor (SFT) is an uncommon tumor of mesenchymal origin, which can arise at any anatomic location and can exhibit versatile histological features and a clinical course ranging from benign to frankly malignant. Lipomatous (fat-forming) SFT is a morphological variant of SFT characterized by an adipose tissue component. Breast SFT is an extremely rare clinical entity, and the literature review yielded only 28 previously reported cases.