Reason: 28 y/o with AS, c/o thigh pain, night pain unclear etiology History: thigh pain/night pain There is marrow edema along the medial femoral neck with periosteal reaction and a subtle focus of linear T1 signal which likely represent a stress fracture. Alignment of the hip joint is anatomic. There is a small amount of edema at the right pubis which is likely degenerative.
Stress fracture of the left femoral neck.