The urachus (plural: urachuses or urachi ref) is the fibrous vestigial remnant of the embryonic allantois.
The lumen of the urachus usually obliterates after birth and it becomes known as the median umbilical ligament, which is covered by a midline linear fibrous fold of parietal peritoneum (called the median umbilical fold), which extends from the apex of the bladder to the umbilicus. It is located in the retropubic space.
If the lumen does not completely involute, a spectrum of urachal remnants may persist, including:
A urachal remnant may transform into an adenocarcinoma.
- 1. Yu JS, Kim KW, Lee HJ, Lee YJ, Yoon CS, Kim MJ. Urachal remnant diseases: spectrum of CT and US findings. (2001) Radiographics : a review publication of the Radiological Society of North America, Inc. 21 (2): 451-61. doi:10.1148/radiographics.21.2.g01mr02451 - Pubmed
- 2. Moore KL, Agur AMR, Dalley AF. Clinically oriented anatomy. LWW. ISBN:1451119453. Read it at Google Books - Find it at Amazon
- 3. Last's anatomy, regional and applied. Churchill Livingstone. ISBN:044304662X. Read it at Google Books - Find it at Amazon
- 4. Parada Villavicencio C, Adam SZ, Nikolaidis P, Yaghmai V, Miller FH. Imaging of the Urachus: Anomalies, Complications, and Mimics. Radiographics : a review publication of the Radiological Society of North America, Inc. 36 (7): 2049-2063. doi:10.1148/rg.2016160062 - Pubmed