Donald School Journal of Ultrasound in Obstetrics and Gynecology

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VOLUME 14 , ISSUE 2 ( April-June, 2020 ) > List of Articles


Vasa Previa Depicted by Simple Clear Flow

Ai Sakamoto, Nobutsugu Oguni, Tadashi Hashimoto, Tomoyoshi Takata

Keywords : Antenatal diagnosis, Low-lying placenta, Power Doppler, Simple Clear Flow, Vasa previa

Citation Information : Sakamoto A, Oguni N, Hashimoto T, Takata T. Vasa Previa Depicted by Simple Clear Flow. Donald School J Ultrasound Obstet Gynecol 2020; 14 (2):161-163.

DOI: 10.5005/jp-journals-10009-1628

License: CC BY-NC 4.0

Published Online: 30-07-2020

Copyright Statement:  Copyright © 2020; The Author(s).


We present our experience of diagnosing vasa previa using Simple Clear Flow (SCF) at 32 weeks and 1 day of gestation. A 32-year-old pregnant Japanese woman was reexamined using transvaginal SCF due to suspected vasa previa on previous routine obstetric examination. Simple Clear Flow clearly depicted a small velamentous artery and vein at the periphery of the posterior low-lying placenta near the internal cervical os. At 37 weeks of gestation, emergency cesarean section was performed due to irritable uterine contractions, resulting in a viable, single female newborn weighing 2,795 g. Placental examination showed velamentous insertion of the umbilical cord with aberrant vessels. Transvaginal SCF can clearly demonstrate small aberrant vessels of the umbilical cord without Doppler blooming and may become a useful modality for the antenatal diagnosis of vasa previa.

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