1. From the Department of Radiology, Texas Children’s Hospital, 6701 Fannin St, Suite 470, Houston, TX 77030 (E.K.S., A.R.M.R., R.C.O.); Department of Surgery, Children’s Hospital of Michigan, Detroit, Mich (P.I.A.); Department of Radiology, Geisinger Wyoming Valley Medical Center, Wilkes Barre, Pa (M.C.P.); and Department of Pediatric and Adolescent Gynecology, Texas Children’s Hospital, Houston, Tex (J.E.D.).