This study aims to determine the number of sufferers, disease patterns based on sex, age, radiological features, type of surgery performed, place of treatment, results of postoperative Anatomy Pathology and the condition of post-treatment patients in cases of abdominal tumors in children. This research method is descriptive retrospective. Retrospectives were obtained in Dr. Hospital's medical records Wahidin Sudirohusodo from 2014 to 2017. The results of this study showed that cases of malignant abdominal tumors in children were found 83 cases, the distribution of 44 cases (69.23%) and 39 cases (30.77%) for women, the youngest age was 6 months and the oldest is 16 years, most at the age of 3-6 years. Abdomen ultrasound examination and CT scan Abdomen tumor location of the most nephroblastoma 23 cases (44.23%). Surgery was performed in 38 cases (65.71%), the results of Anatomical Pathology after nephroblastoma surgery were 25 cases (48.07%). The surgical department treated 35 cases (67.30%) and pediatric 17 cases (22.70%). This type of surgery performed 11 cases (47.82%) nephrectomy, 4 cases (17.39%) biopsy laparotomy and 8 cases (34.78%) laparotomy removal of the tumor. The condition of the patient when healed 10 cases (43.47%), forced to go home 7 cases (30.43%) and died 6 cases (26.2%) The average patient with a malignant abdominal tumor in children came with an advanced stage. Not a good recording and monitoring system causes the final results can not be well known.