1. From the Division of Emergency Radiology (M.H.S.), Department of Radiology (A.C., P.L.), Montefiore Medical Center, Albert Einstein College of Medicine, 111 E 210 St, Bronx, NT 10467; Department of Radiology, Westchester Medical Center, Valhalla, NY (W.A.G.); and Department of Radiology, Rutgers New Jersey Medical School, Newark, NJ (R.J.D.).