Retention of a Double-J Stent Upper Coil in the Renal Parenchyma Following Percutaneous Nephrolithotomy: A Case Report.

Percutaneous nephrolithotomy (PNL) is a standard treatment for large renal stones, and the use of a double-J (JJ) stent is common for postoperative drainage. Here, we report a rare complication involving retention of the upper coil of a JJ stent within the renal parenchyma following PNL. A 47-year-old man underwent left-sided PNL with placement of an antegrade JJ stent and Malecot catheter. Although initial imaging confirmed correct stent positioning, subsequent attempts at stent removal failed. Ureteroscopy revealed that the upper coil was embedded in the renal parenchyma, likely at the site of the prior puncture. Laser dissection was required to release the stent, which was successfully removed and replaced. This case highlights the potential risk of stent misplacement when used with a Malecot catheter and underscores the importance of fluoroscopic guidance during catheter removal and consideration of stent repositioning to prevent similar complications.