ESPU Congress 2018 - Abstract Book

112 29 th CONGRESS OF THE ESPU 08:32–08:35 S13-7 (PP) DO IMAGE-DEFINED RISK FACTORS RELIABLY PREDICT THE RISK OF ASSOCIATED NEPHRECTOMY IN ABDOMINAL NEUROBLASTOMA SURGERY? Sebastien FARAJ  1 , Estelle THEBAUD  2 , Marie Pierre QUERE  3 , Stephanie PROUST  4 , Isabelle PELLIER  4 and Marc David LECLAIR  1 1) CHU Nantes, Pediatric Surgery, Nantes, FRANCE - 2) CHU Nantes, Pediatric Oncology, Nantes, FRANCE - 3) CHU Nantes, Pediatric Radiology, Nantes, FRANCE - 4) CHU Angers, Pediatric Oncology, Angers, FRANCE PURPOSE Image Defined Risk Factors (IDRF) represent a list of preoperative protocol criteria to assess poten- tial resectability of neuroblastoma, hence the need for preoperative chemotherapy. We investigated the prevalence of renal vessels infiltration criteria, its evolution before/after chemotherapy, and its impact on the risk of associated nephrectomy. MATERIAL AND METHODS Retrospective monocentric study of 81 consecutive abdominal neuroblastic tumours (1999–2016). Double blinded review of all preoperative CT-scan studies (at diagnosis and after chemotherapy) by pediatric surgeon and radiologist assessing the presence of the renal IDRFs (infiltration or encase- ment of renal pedicle). Main outcome measures were difficulties of surgical resection, the need for additional organ resection (based on surgical report), and the extent of surgical resection (based on pathology report). RESULTS Among 28/81 children without any renal IDRF present at diagnosis, 27/28 underwent complete macroscopic tumour resection, and none required nephrectomy in addition to tumour resection. When infilitration of renal pedicle was present at diagnosis, it disappeared in 21/53 (40 %) after chemotherapy, in whom none underwent nephrectomy. Among the 32 children who kept renal IDRF after chemotherapy, 7/32 had macroscopic incomplete resection, and 12/32 required associated nephrectomy. There was no difference between “infiltration” and “encasement” IDRFs to predict the risk of associated nephrectomy (12/53, 23 % vs 11/35, 31 %, p=0,8). CONCLUSIONS Renal IDRFs are relevant to predict safe resectability of neuroblastoma. Children with IDRF which disappear after chemotherapy achieve the same surgical outcome than those without IDRF. 08:35–08:40 S13-8 (VP) PRONE RETROPERITONEOSCOPY FOR ADRENAL TUMORS Maria Esmeralda KUAN  1 , Jerónimo GONZÁLAVEZ  1 , Natalia GALLEGO  1 , María Soledad FERNÁNDEZ  2 and Pedro ALCARAZ  1 1) Hospital General Universitario de Alicante, Pediatric Surgery, Alicante, SPAIN - 2) Complejo Hospitalario Universitario de Albacete, Pediatric Surgery, Albacete, SPAIN PURPOSE In adrenal tumors 5 cm or less, with no invasion and metastasis are feasible through MIS. Prono retroperitoneoscopy is a feasible technique due to its direct access to the adrenal gland and its vessels, avoiding the time and morbidity of mobilizing the colon in the transabdominal approach.