Introduction. Calyx diverticulum is a rather rare pathology in pediatric practice. In the structure of cystic kidney malformations, it amounts up to 12-15%. In most cases, the disease is asymptomatic. To make a differential diagnostics and to define a technique for surgical treatment, computed tomography or magnetic resonance imaging are used. Currently, puncture-sclerotic method and endosurgical (laparoscopic, retroperitoneoscopic) one can be successfully applied. The main purpose of this clinical observation is to illustrate that little-traumatic laparoscopic access to the kidney and plasma ablation of the diverticulum epithelial lining can be used to have successful outcomes.

Material and methods. The authors describe a clinical case of renal cavities in a 12-year-old boy - calyx diverticulum of the right kidney and a cyst of the left kidney - which were successfully treated with a combined approach when puncture and laparoscopic corrections were used depending on lesion’s chracteriatics.

Conclusion. A rational approach and substantiation of the applied surgical technique with plasma ablation of calyx diverticulum cavity allowed to obtain good results - cavity size was reduced and renal parenchyma was preserved what is important for future organ functioning.