II. Physiology
III. Signs
- Persistent drainage from newborn Umbilicus
- Delayed separation of Umbilical Cord
- Omphalitis
IV. Causes: Urachal Anomaly (Urachus not fully obliterated)
- Patent Urachus (50%)
- Urachal Cyst (30%)
- Cyst of desquamated epithelial cells
- Small and undetected in two thirds of cases
- Risk of urachal abscess with secondary peritonitis
- Urachal Sinus
- Communication with Umbilicus
- Vesicourachal Diverticulum (Bladder Diverticulum)
V. Radiology: Urachal Anomaly Detection
- CT Abdomen (best evaluation)
- Abdominal Ultrasound
- Voiding Cystourethrogram (if umbilical discharge)
VI. References
- Hollinshead (1985) Anatomy, Harper and Row, p. 756
- Lotan (2002) Am Fam Physician 65(10):2067-8 [PubMed]
- Razvi (2001) Pediatrics 108(2):493-4 [PubMed]
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Definition (NCI_NCI-GLOSS) | A fibrous cord that connects the urinary bladder to the umbilicus (navel). The urachus is formed as the allantoic stalk during fetal development and lasts through life. |
Definition (NCI) | The urinary canal of the fetus; postnatally it is usually a fibrous cord but occasionally persists as a vesicoumbilical fistula. (MeSH) |
Definition (MSH) | An embryonic structure originating from the ALLANTOIS. It is a canal connecting the fetal URINARY BLADDER and the UMBILICUS. It is normally converted into a fibrous cord postnatally. When the canal fails to be filled and remains open (patent urachus), urine leaks through the umbilicus. |
Concepts | Embryonic Structure (T018) |
MSH | D014497 |
SnomedCT | 14105008 |
English | Urachus, urachus, median umbilical ligament, Structure of urachus (body structure), Structure of urachus |
Swedish | Fostrets urinkanal |
Czech | urachus |
Finnish | Urakus |
Russian | URAKHUS, MOCHEVOI KHOD, МОЧЕВОЙ ХОД, УРАХУС |
Portuguese | Úraco |
Polish | Przewód omoczniowy, Moczownik |
Norwegian | Urachus, Fosterets urinkanal |
Spanish | estructura del uraco (estructura corporal), estructura del uraco, uraco, Uraco |
French | Ouraque |
German | Urachus |
Italian | Uraco |
Dutch | Urachus, Urinekanaal |
Ontology: Persistent umbilical sinus (C0266357)
Definition (NCI) | A congenital abnormality that results from the failure of the lumen of urachus to be obliterated. It presents with leakage of urine from the bladder through the umbilicus. |
Concepts | Congenital Abnormality (T019) |
ICD10 | Q64.4 |
SnomedCT | 123282008, 34351008, 205018004, 253898008, 398316009 |
English | Persistent umbilical sinus, patent urachus (diagnosis), patent urachus, urachus patent, Patent Urachus, Urachus: [patent] or [persistent] (disorder), Persistent umbilical sinus (disorder), Urachus: [patent] or [persistent], Persistent urachus, Patent urachus, Patent urachus (disorder), Patent urachal duct, persistent; urachus, urachus; patent or persistent, urachus; persistent, Patent urachus -RETIRED-, Patent of urachus |
Spanish | uraco patente, uraco patente - RETIRADO -, uraco patente - RETIRADO - (concepto no activo), uraco patente (trastorno), uraco persistente, seno umbilical persistente, uraco permeable (trastorno), uraco permeable |
Dutch | persisterend; urachus, urachus; open of persisterend, urachus; persisteren |