Fat-forming variant of solitary fibrous tumor(fat-forming variant of SFT), previously calledlipomatous hemangiopericytoma (L-HPC), is a recentlyrecognized rare variant of solitary fibrous tumor (SFT)with unpredictable biologic behavior. Fat-forming variantof SFT occurs predominately in the deep soft tissues ofthe lower extremities. Histologically, it is composed of anadmixture of benign hemangiopericytomatous andlipomatous components. Up to now, only 37 cases havebeen reported in the English literature worldwide andthe molecular analyses are sparse. Reported herein is thefirst Chinese case of fat-forming variant of SFT. Althoughone case of fat-forming variant of SFT in the Fat-forming variant of solitary fibrous tumor (fat-forming variant of SFT), previously called lipomatous hemangiopericytoma (L-HPC), is a recentlyrecognized rare variant tumor of solitary fibrous tumor (SFT) with unpredictable biologic behavior. Fat-forming variant of SFT occurs predominately in the deep soft tissues of the lower extremities. Histologically, it is composed of anadmixture of benign hemangiopericytomatous andlipomatous components. Up to now, only 37 cases havebeen reported in the English literature worldwide and the molecular analyzes are sparse. Reported herein is thefirst Chinese case of fat -forming variant of SFT. Althoughone case of fat-forming variant of SFT in the