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Line diagram to measure fetal renal pelvic anteroposterior diameter. The APD is measured in the transverse axial image of the renal pelvis at level of the renal hilum. Antenatal ultrasound at 38-weeks showing right-sided hydronephrosis in transverse view (+---+): 11.9 mm. Anteroposterior diameter of the kidney (×---×): 28.8 mm
