# Case Report: Long-term complications of subcutaneous ureteral bypass migration in an adult female Papillon

## TL;DR

A Papillon dog with a single kidney experienced long-term complications from a urinary bypass device, emphasizing the need for careful monitoring.

## Contribution

This case report documents the long-term migration and complications of a subcutaneous ureteral bypass in a canine patient.

## Key findings

- The nephrostomy and cystostomy catheters migrated into the renal parenchyma and bladder wall over time.
- The SUB shunting port was removed due to migration, obstruction, and extrusion.
- Kidney function remained normal despite complications, and ureteroliths disappeared by the end of the observation period.

## Abstract

A 6-year-old spayed female 4.4-kg Papillon with only the left kidney presented with vomiting. Imaging unveiled ureterolithiasis and hydronephrosis, while serum chemistry displayed elevated creatinine, blood urea nitrogen, and C-reactive protein. Urinalysis revealed bacteria and bacterial phagocytes. After subcutaneous ureteral bypass (SUB) placement, kidney panels were normalized. The nephrostomy and cystostomy catheters had migrated into the renal parenchyma and bladder wall on postoperative day (POD) 212 and 369, respectively. As the migration advanced, they entered the ureter and bladder on POD 369 and 796, respectively. The SUB, excluding the nephrostomy catheter, was removed on POD 930 due to migration, obstruction, and extrusion of the SUB shunting port. On POD 937, creatinine and BUN levels remained normal. By POD 1063, the ureteroliths had disappeared. This case highlights the need for vigilant monitoring of catheter migration as a potential complication following SUB placement. Early identification and timely intervention are essential for reducing morbidity and improving patient outcomes.