2nd Department of Gynecology and Obstetrics, Wroclaw Medical University, Wroclaw, Poland.
Ginekol Pol. 2021;92(8):595-596. doi: 10.5603/GP.a2021.0156.
An urachus is a remnant of allantois in embryo development constituting a connection between the dome of the bladder and umbilicus. It develops on day 16 after conception and closes during the pregnancy to form the median umbilical ligament. Patent urachus results from a failure in closing its lumen in 10-12 gestational weeks. This anomaly occurs in 1-2 babies in 100,000 births. We present the case of patent urachus. In 20 gestational weeks, a dilatation of the umbilical cord with an anechoic mass with a transverse dimension of 19 x 12 mm starting from the fetal insertion and length of 30 cm was seen on ultrasound without any other fetal and placental disorders. Histology showed cystic edema. Prenatal diagnosis of patent urachus can be difficult because this pathology may be mistaken with other, more dangerous causes of cord cysts; thus, the occurrence of cord cysts should be closely monitored.
脐尿管是胚胎发育过程中尿囊的残余物，构成膀胱顶和脐之间的连接。它在受孕后第 16 天发育，在妊娠期间关闭形成脐正中韧带。脐尿管未闭是由于在妊娠 10-12 周时其管腔未能关闭所致。这种异常在 10 万例分娩中发生 1-2 例。我们报告脐尿管未闭的病例。在妊娠 20 周时，超声检查发现脐带扩张，有一无回声肿块，从胎儿插入处开始，横径为 19×12mm，长 30cm，无其他胎儿和胎盘异常。组织学显示囊性水肿。脐尿管未闭的产前诊断可能较为困难，因为这种病理可能与其他更危险的脐带囊肿原因相混淆；因此，应密切监测脐带囊肿的发生。
