RESUMO
INTRODUCTION: Primary bone liposarcoma are extremely rare tumors and their location in the fibular head is exceptional. CASE REPORT: A 19 year-old patient with a pain on the lateral of the proximal leg. The X-ray found an osteolytic lesion; MRI of the knee revealed a proximal epiphyseal-metaphyseal lesion process of the right fibula contours with cortical lysis and local medullary damage. The pathological study, follow by the immunohistochemical exam and the FISH concluded in an amplification of MDM2 (Murine double minute 2) confirming the presence of a liposarcoma. DISCUSSION: The primary bone localization of liposarcomas remains rare. Their localization at the level of the fibular head is exceptional. The proximal fibula is mainly affected by benign tumors, in particular giant cell. Malignant tumors localized to the head of the fibula as well as aggressive benign tumors most often require en bloc resection. CONCLUSION: Although rare, primary liposarcomas can localize to the head of the fibula. It is necessary to establish a clinical, radiological and histological diagnosis for adequate management.
