1. From the Department of Radiology, Boston Medical Center, Boston, Mass (B.Z.M., J.P.); Department of Diagnostic Imaging, Warren Alpert Medical School of Brown University and Rhode Island Hospital, 593 Eddy St, 3rd Floor, Providence, RI 02903 (E.H.D., A.P.L.); and Department of Pathology, Beth Israel Deaconess Medical Center, Boston, Mass (L.M.Q.).