Figure 2
A 47-year-old man with ankylosing spondylitis. (A) X film showed a large soft tissue around the dislocated THA extending to pelvic. (B) Computed tomographic (CT) scan at admission showed a huge mass extending to the pelvic with serious bone destruction. (C) We performed hemipelvic reconstruction, and non-significant polyethylene wear was detected. (D) Postoperative histopathology showed proliferation of fibrovascular tissue and fibroadipose tissue around the canal and the adjacent soft tissue along with a few scattered lymphocytes. No malignant lesions were detected but mainly a lot of necrosis.