FEMORAL PAROSTEAL OSTEOSARCOMA: CASE REPORT

Faten Limaiem* and Saadia Bouraoui

ABSTRACT

Introduction: parosteal osteosarcoma is a low-grade, bone-forming neoplasm that arises on the surface of bone. It accounts for about 4% of all osteosarcomas. Case report: an 18-year-old male patient with no particular past medical history, consulted for a painless mass in the right thigh that had appeared at the age of 17 years and progressively increased in volume. The physical examination revealed a 6 cm mass at its largest above the right popliteal fossa with knee flexion slightly limited. The X-ray revealed a well-limited mass in the lower third of the femur that was dense and attached to the metaphyseal cortex by a wide base. Histological examination of the biopsy specimen established the diagnosis of parosteal osteosarcoma. The patient underwent wide resection of the femoral tumor preceded by a course of first-line chemotherapy. Postoperative course was uneventful. During the one-year follow-up period, there was no recurrence or metastasis of the tumor. Conclusion: parosteal osteosarcoma is characterized by its insidious growth and favorable prognosis. It rarely leads to metastasis. Its treatment is mainly surgical.

Keywords: Parosteal osteosarcoma, bone, tumor, pathology.