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Renal vein Doppler ultrasound of maternal kidneys in normal second and third trimester pregnancy

N Karabulut, MD¹, A Baki Yaci, MD and A Karabulut, MD²

¹ Department of Radiology, Pamukkale University Hospital, 20010, Denizli and ² Clinic of Obstetrics and Gynaecology, Denizli State Hospital, 20010, Denizli, Turkey

View larger version (99K): [in a new window]   Figure 1. Doppler ultrasound of the right kidney in a 28-year-old non-pregnant woman shows normal phasic oscillations in the intrarenal veins with reduced pre-systolic component (small arrow). The intrarenal venous impedance index was 0.43. Large arrow indicates peak venous flow signal.

View larger version (99K): [in a new window]   Figure 2. 24-year-old asymptomatic woman with 32 weeks' singleton gestation. Doppler ultrasound of the right kidney with grade 2 pyelocaliectasis shows flattened venous waveform and a reduced intrarenal venous impedance index (0.12) owing to elevated pre-systolic flow (small arrow). Large arrow indicates peak venous flow signal.