1. From the Departments of Radiology (J.M.B., C.J.L., B.L.R.) and Pathology (K.A.H., R.O.B.), San Antonio Military Medical Center, 3551 Roger Brooke Dr, San Antonio, TX 78219; and F. Edward Hébert School of Medicine, Uniformed Services University of the Health Sciences, Bethesda, Md (B.L.R.).