Abdominal Neuroblastoma Laparoscopic Surgery Risk Factors Stratification

Inclusion Criteria: 1. Patients with neurogenic tumors meeting the criteria of groups I-III: Group I * low or moderate risk group according to pilot difficulty scoring system (less than 5 points, see supplementary material); * no IDRF; Group II: * low or moderate risk group according to pilot difficulty scoring system (less than 5 points); * patients with any number of IDRFs and without central tumor location and/or tumor extension across the midline and/or tumor volume (cm3)/patient height (m) ratio = 28 or more. Group III: * 2 and more IDRF + central tumor location and/or tumor extension across the midline; * 2 and more IDRF + tumor volume (cm3)/patient height (m) ratio = 28 or more; * 2 and more IDRF + 2 and more other risk factors according to pilot difficulty scoring system; * 1 IDRF + tumor extension across the midline + tumor volume (cm3)/patient height (m) ratio = 28 or more. 2. Age from 0 to 18 years. 3. Preoperative imaging (abdominal contrast-enhanced computed tomography (CT), performed no later than 14 days before the planned surgery). 4. Indications for surgery based on the decision of multidisciplinary experts board in centers- participants. 5. Written voluntary informed consent of the patient and / or his legal representative. Exclusion Criteria: 1. 3 and more IDRF + central tumor location and/or tumor extension across the midline and/or tumor volume (cm3)/patient height (m) ratio = 28 or more. 2. Severe concomitant pathology, increasing anesthesiologic and surgical risks, via the desicion of the research physician or conclusion by multidisciplinary team in centers- participants. 3. Tumor volume does not technically allow to provide minimally-invasive surgery, based on the conclusion of multidisciplinary experts board team in centers- participants. 4. Therapy strategy: observation \-