Pyeloplasty is a surgery to repair the kidney. Specifically, it repairs a part of the kidney called the renal pelvis. The renal pelvis is a funnel-like structure. It connects the kidney to a tube called the ureter. This tube carries urine to the bladder.

Kidney and Ureter
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Pyeloplasty is done if a blockage is found at the renal pelvis. This blockage prevents the urine from passing and makes the kidney swell.