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Congress: ECR26
Poster Number: C-17761
Type: Poster: EPOS Radiologist (educational)
Authorblock: M. A. Corral De La Calle, N. M. Bornot Román, G. S. Fonseca, L. Moya Romero; Avila/ES
Disclosures:
Miguel Angel Corral De La Calle: Nothing to disclose
Nalini María Bornot Román: Nothing to disclose
Guillermo Sánchez Fonseca: Nothing to disclose
Laura Moya Romero: Nothing to disclose
Keywords: Abdomen, Anatomy, Urinary Tract / Bladder, CT, MR, Ultrasound, Diagnostic procedure, Education, Congenital, Diverticula, Fistula
Learning objectives Remind the embryological development and definitive anatomy of the urachus. Review the clinical and radiological presentation of pathological conditions that may involve it.
Read more Background In the first trimester of embryonic life, the allantois communicates the dome of the anterior urinary component of the cloaca (later the urogenital sinus) to the umbilicus, allowing urine drainage. From the 12th to the 20th weeks of gestation, the lumen of the allantois involutes until becoming a fibromuscular remnant in the midline, the urachus, which connects the dome of the bladder, which has already become independent, to the umbilicus at the midline (Fig.1).The urachus is variable in length (1-15...
Read more Findings and procedure details CONGENITAL URACHAL ANOMALIES (Fig.5) occur in 1/5000 individuals, with 2/1 male-to-female ratio.Patent urachus or urachal fistula (Fig.6), secondary to complete failure of allantoic duct regression, is the most frequent (50%). It can be associated with omphalocele, posterior urethral valves (1/3) and prune belly syndrome. Clinically, there is umbilical urine leakage with or without infection, although it can remain asymptomatic until adulthood. A tubular hollow structure is seen between the bladder dome and the umbilicus. If complete patency is in doubt,...
Read more Conclusion It is important to know the embryological development and anatomy of the urachus to understand its pathological spectrum.Patent urachus or urachal fistula, secondary to complete failure of allantoic duct regression, is the most frequent congenital urachal anomaly, followed by urachal cyst, sinus and diverticulum. Radiological diagnosis may be incidental and is usually easy to achieve.Infection is commonly secondary to prior urachal anomalies, although it can also appear due to a nearby inflammatory condition, mainly Crohn disease. The clinical picture, along...
Read more References Yagi F, Akita H, Yamada Y, Jinzaki M. Imaging of the umbilicus. Abdom Radiol (NY). 2025;50(12):6201-13. doi: 10.1007/s00261-025-05007-6. Buddha S, Menias CO, Katabathina VS. Imaging of urachal anomalies. Abdom Radiol (NY). 2019;44(12):3978-89. doi: 10.1007/s00261-019-02205-x. Das JP, Vargas HA, Lee A, Hutchinson B, O'Connor E, Kok HK, et al. The urachus revisited: multimodal imaging of benign & malignant urachal pathology. Br J Radiol. 2020;93(1110):20190118. doi: 10.1259/bjr.20190118. Luo X, Lin J, Du L, Wu R, Li Z. Ultrasound findings of urachal anomalies. A series of...
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