Ventriculo-Pyelo-"Allium" shunt as last resort procedure for complex pediatric hydrocephalus - first case described.

Ventriculo-pyeloureteral (VPU) shunting is a rare salvage procedure for hydrocephalus when traditional ventriculoperitoneal (VP) and ventriculoatrial (VA) shunts fail. We report the successful use of a self-expanding, nitinol-based ureteral stent (Allium Medical Solutions, Israel) to facilitate VPU shunting in a toddler with complex multicystic hydrocephalus. A premature infant born with duodenal atresia developed severe post-hemorrhagic hydrocephalus resistant to multiple VP and VA shunt revisions due to extensive peritoneal adhesions and recurrent atrial thrombosis. A VPU shunt was attempted as a last resort but was complicated by urinoma formation and obstruction due to the small caliber of the toddler's ureter relative to the catheter. To salvage the procedure, a large-caliber Allium ureteral stent was deployed to passively dilate the ureter, creating a protected channel for the shunt catheter. At 7 months follow-up, the patient demonstrated stable neurological function, effective CSF drainage, and no vesicoureteral reflux. This case highlights that VPU shunting combined with an Allium stent is a viable last-resort option, preventing ureteral obstruction by the shunt catheter.