A, Anteroposterior view of left hip of 50-year-old woman with history of breast cancer. She had been disease free for 2 years. Lytic lesion is seen in femoral neck. Although the most likely diagnosis for this lesion is metastatic carcinoma, biopsy must be performed in appropriate fashion. This lesion proved to be malignant fibrous histiocytoma. B, Anteroposterior view of left hip after wide resection and endoprosthetic reconstruction. If this patient had been treated with prophylactic fixation of presumed metastatic carcinoma, her outcome would have been severely compromised.