Male, 23 years old, military occupation, previously healthy, is presented to the emergency department for left gonalgia, with no traumatic history, with a radiographic finding of a juxtacortical mass in the right distal femur. With normal physical examination An incisional biopsy of the distal femur was performed, reporting the histopathological study of parostal osteogenic sarcoma, posteriorly performing wide tumor resection of distal femur and right proximal tibia with placement of unconventional tumor prosthesis Currently he is walking with partial support of the limb and has not presented complications in healing. Osteosarcoma is the most common malignant bone tumor in children and adolescents. Before the popularization of limb salvage surgery, amputation was the standard of care for malignant bone tumors. The primary goal of surgical treatment of bone sarcoma is to achieve complete resection of the primary tumor with negative margins.
