Relapsed papillary urothelial neoplasm of low malignant potential (PUNLMP) of the young age: a case report and a review of the literature.

Background: Papillary Urothelial Neoplasm of Low Malignant Potential (PUNLMP) are exceptionally rare in the first decade of life (mostly if multifocal) and there is a lack of standardized recommendations for the pediatric age.

Case Presentation: We describe the case of a 9-year-old boy with a diagnosis of PUNLMP, who underwent to cystoscopic lesion removal and later to endoscopic lesion removal and intra-bladder Mitomycin-c (MMC) instillations for relapsed disease. Follow-up investigations at five years showed disease negativity.

Conclusions: Intra-bladder MMC instillation may allow obtaining the complete remission with bladder-sparing for paediatric patients with a high-risk relapsed PUNLMP.