Routine second trimester scan.
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The fetal left kidney is seen enlarged with moderate hydronephrosis and stretched parenchyma. The AP diameter of the renal pelvis measures 15 mm. There is a ballooning of the renal pelvis with no visualized dilated left ureter.
Normal size of the fetal right kidney with no pelvicalyceal dilatation.
Normal urinary bladder.
This case shows typical example of prominent fetal hydronephrosis. The dilatation doesn't extend to the ureter and the renal pelvis is ballooned, then pelviureteric junction obstruction is suggested. Postnatal renal ultrasound is recommended for follow-up, as this degree of dilatation could make surgical intervention more proposed management.