Color/power Doppler (HD-flow™, GE Healthcare, Milwaukee, WI, USA) in other renal abnormalities. A, A': In a case of horseshoe kidney, color Doppler sonography demonstrates a variable pattern of afferent and efferent vessels departing from the lumbar tract of the aorta. B, B': In a case of bilateral duplex kidney, color Doppler sonography demonstrates 2 renal arteries in most cases. C, C': In a case of crossed ectopia, the vessels are clearly positioned asymmetrically. Source: COLOR DOPPLER SONOGRAPHY IN OBSTETRICS, Sonography in Obstetrics and Gynecology: Principles & Practice, 7e Citation: Fleischer AC, Toy EC, Lee W, Manning FA, Romero RJ. Sonography in Obstetrics and Gynecology: Principles & Practice, 7e; 2014 Available at: https://obgyn.mhmedical.com/DownloadImage.aspx?image=/data/books/1414/fle_ch12_f037.png&sec=76391717&BookID=1414&ChapterSecID=76391635&imagename= Accessed: October 29, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved