R Joshua Dym1, Howard P Forman2, Meir H Scheinfeld3. 1. Department of Radiology, Section of Emergency Radiology, University Hospital, Rutgers New Jersey Medical School, Newark, NJ. 2. Department of Radiology and Biomedical Imaging, Yale School of Medicine, Yale University, New Haven, Conn. 3. Department of Radiology, Division of Emergency Radiology, Montefiore Medical Center, Albert Einstein College of Medicine, 111 E 210 St, Bronx, NY 10467.