1. From the Departments of Pediatric Surgery (PD, PP-C, AE, YA), Pathology (DB, MP) and Radiology (CG), Hôpital Robert Debré, Assistance Publique, Hôpitaux de Paris and EA 3102, Université Paris VII (PD, DB, AE, MP, YA) and Pediatric Oncology (JM, HB), Institut Curie, Paris, France