forearm movement. Axial unenhanced CT scan of left forearm demonstrating the well-defined area of ossification related to the radial surface of the ulna. No cortical destruction or definite associated soft tissue mass is identified.
forearm movement. Coronal Proton Density MR left forearm demonstrating the ossification as low signal areas (arrowheads). Note the central band of the interosseous membrane (arrow). There is no bone marrow or soft tissue mass.