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En la población pediátrica, los pólipos representan la primera causa de sangrado colorrectal con una prevalencia del 1 %. De ellos, el 90 % corresponde a pólipos juveniles (PJ) .

Posterior urethral valves are the most common cause of bladder outlet obstruction in male newborns. Initial catheter drainage alleviates the urethral obstruction before definitive management by valve ablation. Newborns with posterior urethral valves often present with hypercontractile bladders that may inhibit upper tract drainage despite bladder catheterization. Anticholinergic agents are commonly used to treat detrusor hyperactivity, with oxybutynin being the most commonly used. We report the first case of a newborn with posterior urethral valves and ureterovesical junction obstruction caused by detrusor hypertrophy who underwent urgent intravesical instillation of oxybutynin at high doses in an attempt to avoid a diversion procedure.

Ureteral stump syndrome is a medical condition caused by a refluxing distal ureteral remnant left after nephrectomy. Fungal colonization of the ureteral stump is uncommon and distant site infection is exceptional. We present a unique case of fungal peritonitis in a 13-year-old boy who had a right lower-moiety heminephro-ureterectomy at age three with a ureteral stump that served as reservoir for Candida resulting in the subsequent spontaneous fungal passage to the peritoneum.