The patient was placed in the supine position on CT scanner table, and an initial scan was performed to localize the lesion. The skin was then prepped and draped in a sterile fashion. The skin and subcutaneous tissues were anesthetized with 1% lidocaine. A small dermatotomy was made, and a coaxial needle was inserted into the left proximal femur under CT guidance. Once in appropriate position, a 14-gauge biopsy needle was used to obtain tissue samples. Pre and post images demonstrated appropriate position of the biopsy needle within the mass. Once adequate tissue samples were obtained, the coaxial needle was removed.