Anomalies of the urachus are occasionally encountered in surgical practice. Herbst1 states that the earliest recorded case in the literature was reported by Cabral in 1550, but the first clear-cut description was by Tait2 in 1886. Callanan3 in 1951 summarized the cases since Dudgeon collected 154 cases in 1940. Individual cases have since been reported by Getz and Thomas4 in 1950 and by Helsby5 in 1955.
The human embryo at the six somite stage of development forms a cloaca which is a common receptacle for urinary and gastrointestinal waste products. The allantois develops at the cephalic end of the cloaca. This latter structure is a vestigial remnant which is intimately related with the development of the placenta and umbilical cord. The urachus (elongated apex of the bladder) is continuous with the allantois at the umbilicus. After birth, the descent of the urinary bladder to the
MANN LS, GIANNOLA JF. Anomalies of the Urachus in the Adult Patient. AMA Arch Surg. 1957;74(2):245–250. doi:10.1001/archsurg.1957.01280080099015