Available are the results of surgical treatment (Andersen-Hynes operation and its modifications) of 85 children with hydronephrosis bor the period 1981-1987. The patients' age ranged from 6 months to 14 years. Anastomotic stenosis occurred in 12% of the procedures as a result of: urethral or pelvic trauma when suturing, wound channels due to the needle perforating puncture, catgut unwanted properties, tissue strain at the anastomosis site, inadequate renal drain. This necessitates modification of the operative technique: surgical manipulations restricted to the operated on pelvic part and pelvic-urethral segment, optical amplification, microsurgical instruments, synthetic suture. An original pyelostoma made of silicon rubber was used in draining. Out of 34 surgical cases, good results were achieved in 31, satisfactory in 3. No complications were recorded.
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