1. From the Departments of Radiology (S.H.C., R.M., M.M.J., M.K.P.), Clinical Genetics (W.C.), and Obstetrics and Gynecology (J.G.C.), David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, Calif; Hoag Hospital, Newport Harbor Radiology Associates, Newport Beach, Calif (N.W.); and Department of Radiology, Olive View–UCLA Medical Center, Sylmar, Calif (A.R.R.).