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MCU of a boy with a left-sided duplex system demonstrates contrast outlined a large filling defect within the base of the urinary bladder in keeping with a large ureterocele which appeared slightly to the left of the midline.
On initial voiding, there was reflux of contrast into a dilated, tortuous lower pole moiety ureter with contrast outlining dilated renal pelvis and multiple lower pole calyces showing preserved papillary impressions. No definite reflux was identified within the upper pole moiety ureter.
No right-sided vesicoureteric reflux was seen (not shown).