1. From the Department of Radiology, University Hospitals Cleveland Medical Center, Case Western Reserve University, 11100 Euclid Ave, B114, Cleveland, OH 44106-4915 (S.R., D.A.S., E.G., E.G.K., M.A.R., N.H.R., S.H.T.); and Department of Pathology, Case Western Reserve University, Cleveland, Ohio (J.M.Y.).