1. From the Departments of Radiology (L.M.L., M.K.P.) and Pathology (J.P.), Ronald Reagan UCLA Medical Center, 757 Westwood Plaza, Suite 1638, Los Angeles, CA 90095; and Department of Radiology, Olive View–UCLA Medical Center, Sylmar, Calif (L.M.L., A.P., M.K.P., M.J.N., C.M.J.).