Figure 1.

Imaging studies of a 61‐year‐old patient with metastatic breast cancer who developed an asymptomatic atypical femoral fracture. (A): Computed tomography (CT) scan scout image of the left femur in January 2014 showed no stress reaction. (B): CT scan scout image in June 2014 shows the asymptomatic atypical stress reaction with localized periosteal reaction (“beaking”) of the lateral cortex of the left femur and diffuse cortical thickening of the diaphysis. (C): A bone scan showed an increased uptake in the lateral cortex of left femoral shaft. (D): Magnetic resonance image of the femur (T1‐weighted) showing a focus of cortical thickening in the lateral cortex of the proximal third of the left femoral shaft with a small amount of overlying soft tissue edema.