Figure 1. MRI of the pelvis without contrast demonstrating the development of edema within the left sacral ala (arrows in left panel) along with associated areas of decreased signal on T1-weighted images, consistent with developing stress fracture. No evidence of osseous metastatic disease is present. The right panel shows a solid rectal mass along the right anterior rectal wall (arrow) with adjacent abnormal lymph nodes. MRI: magnetic resonance imaging.