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©2013 UpToDate ® Print Email Allantoic cyst (Upper panel) Color flow imaging shows the umbilical arteries running around the cyst (arrows). (Lower panel) Photograph of the newborn infant shows the splayed umbilical arteries and leaking of urine through the umbilicus. Reproduced with permission from: Sepulveda W, Bower S, Dhillon HK, Fisk NM. Prenatal diagnosis of congenital patent urachus and allantoic cyst: the value of color flow imaging. J Ultrasound Med 1995; 14:47. Copyright © 1995 American Institute of Ultrasound in Medicine.