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24 - 25 wks single live intrauterine fetus.
There is a well-defined, thin walled, rounded anechoic lesion of 5 mm seen in fetal urinary bladder; causing ' bladder in bladder ' appearance. It is on the left side of bladder. There is no overdistension of urinary bladder.
Both fetal kidneys are present (craniocaudal length: right kidney 24 mm; left kidney, 26 mm). No obvious duplication or hydronephrosis is seen on either side. Renal arterial flow was seen on color Doppler on both sides.
It is left sided ureterocele (5 mm size) without hydronephrosis in the left kidney. This requires monitoring to check development of left sided hydronephrosis or bladder outlet obstruction. Follow up ultrasound should be done in antenatal as well as postnatal period ( 2nd week postnatal).