This child presented with a UTI and was found to have left hydroureter and pelviectasis on Renal US. On bladder US this strangely thick walled cystic structure was seen. Ureteroceles are congenital dilations of the distal portion of the ureter. The dilated ureter can herniate into the bladder. This patient was admitted for antibiotics and urologic excision of the ureterocele.

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