Solitary fibrous tumor in the thigh: review of the literature

Abstract

Solitary fibrous tumors (SFT) of extremities, especially the thighs are very rare. Despite SFTs are generally benign, well-circumscribed soft tissue tumors new cases should be presented and followed up carefully to monitor their biological behavior. In general for tumor classification a biopsy is state of the art. Histological including immunohistochemical patterns for SFTs are defined. MRI and ultrasound are not sufficient for differential diagnosis. Once property identified and defined by size and location, resection with intact tumor capsule may result in full recovery of the patient. Reviewing the literature there are no validated reasons for a wider resection. The current patient was a 41-year-old male. Four years after an arthroscopy of the left knee the patient has been suffering an ongoing swelling of the lateral thigh. Because MRI scan data suggested a synovial sarcoma a biopsy was performed. The tumor was classified as a benign SFT. The diagnosis based on histological findings and the presence of the positive immunohistochemical markers Vimentin, CD34, and CD99. The complete tumor resection with intact capsule was achieved in a final operation. Clinical and in MRI after 54-month outcome period there were no local recurrences.

Fig. 1

X-ray left femur, lateral view, tumor with central calcification (preoperative)

Fig. 2

MRI thigh coronal, tumor left 12.4×6.2 cm² (preoperative)

Fig. 3

MRI thigh axial with contrast (preoperative)

Fig. 4

MRI thigh coronal (54 month postoperative)

Fig. 5

MRI thigh axial with contrast (54 month postoperative)