1. From the American Institute for Radiologic Pathology, 1100 Wayne Ave, Suite 1020, Silver Spring, MD 20910 (M.A.M.); Department of Radiology (M.A.M., A.D.L.) and Division of Gastroenterology and Hepatology (S.S.), MedStar Georgetown University Hospital, Washington, DC; the Joint Pathology Center, Silver Spring, Md (A.K.M.); and Georgetown University School of Medicine, Washington, DC (R.E.G.).