Examples of poorly performed biopsies. A and B, Biopsy resulted in irregular defect in bone, which led to pathologic fracture. C, Transverse incisions should not be used. D, Needle biopsy track contaminated patellar tendon. E, Needle track placed posteriorly, a location that would be extremely difficult to resect en bloc with tumor if it had proved to be sarcoma. F, Multiple needle tracks contaminate quadriceps tendon. G, Drain site was not placed in line with incision.