“…Iliopsoas bursitis may appear on a healthy background [67]. Involvement of the bursa has been reported secondary to osteochondromatosis [17,20,28,57], chondrosarcoma [70], pigmented villonodular synovitis [11,58,64,75], pyogenic bursitis [35,43,44,54,57,64], hip arthroplasty [5,35,44,50,55,67,80], septic arthritis [57,64,67], osteoarthritis [21, 25, 38, 57, 58, 64, 6"7], trauma [9,21,32,64,69], overuse during sporting activities [36,64], and avascular necrosis of the femoral head [9,15,48,57,70,74]. Although bilateral involvement has been reported in rheumatoid arthritis [77], unilateral involvement is the rule [2, 6, 16, 23, 25, 27, 29, 31, 32, 37, 41-43, 51-53, 57, 60, 63, 64, 70, 71, 73, 77].…”