MRI inflammation of the anterior chest wall in an AS patient without clinical signs of chest wall involvement. Bone marrow edema (dashed arrows) of the fourth and fifth right sternocostal joints on frontal and sagittal STIR sequences in a 26-year-old HLA-B27-positive female patient with ankylosing spondylitis but no anterior chest wall pain. The patient reported a 2-year history of inflammatory back pain. Bone marrow edema is also seen in the lower portion of the manubriosternal joint on the left side (arrow). The mammary veins are indicated by arrowheads.