Figure 3

Representative case showed pathological fracture in femoral neck of patient number 17. The preoperative X ray showed the pathological fracture (A). A proximal femoral endoprosthesis was used to reconstruct the bone defect (B). Histological appearance (C) of the lesion featuring infiltration by poorly differentiated squamous carcinoma cells (hematoxylin and eosin (H&E) stain, ×200). Immunohistochemically, the tumor was positive for 34βE12 +, CK5/6 + and p63 +.