Multiplanar MR imaging of the right elbow. A. T1 weighted axial image at the level of the elbow joint, demonstrating a complex effusion (arrow), particularly adjacent to the proximal ulna. B. Contrast enhanced axial image showing enhancement around the joint (arrow). C. T2 weighted axial image again showing extensive joint effusion D. Coronal contrast enhanced image showing the complex effusion and abnormal signal intensity in the medullary canal of the proximal ulna (arrow).