Figure 10.

Psuedo-osteomyelitis. Frontal radiograph of both distal femurs in 2009 (A) demonstrates an irregular area of patchy lucency in the medial condyle of the left femur. There is periosteal reaction in this area as well as more superiorly (arrows). Coronal T1 WI (B) image at the same time in 2009 demonstrate low SI in the medial condyle of the femur extending into the medial epiphysis. There is high SI in these areas on coronal STIR (C) image which extends into the adjacent soft tissues where the periosteal reaction is seen on the radiograph. There is no joint effusion. The patient presented with left knee pain and the imaging was suspicious for osteomyelitis involving the medial distal femur. However, the patient has no fever and cultures were negative. Coronal T1 WI (D) of the same area in 2011 shows resolution of the low SI in the medial condyle and epiphysis. The corresponding high SI on the STIR image (E) has resolved as well.