1. From the Departments of Radiology (C.W.P.T., J.E.N., H.A., K.A.K., N.C.D.) and Pathology (D.D.M.), University of Texas Health at San Antonio, 7703 Floyd Curl Dr, San Antonio, TX 78229; and Department of Radiology, Bryn Mawr Hospital, Bryn Mawr, Pa (C.J.Q.).