What causes adult pelviectasis?

Adult pelviectasis, characterized by the dilation of the renal pelvis, is often caused by urinary obstruction. This obstruction can result from conditions such as kidney stones, ureteral strictures, or tumors that compress the urinary tract. Other contributing factors may include congenital abnormalities or infections that lead to scarring and narrowing of the urinary passages. In some cases, the exact cause may remain unidentified.