urachus


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Related to urachus: patent urachus

urachus

[′yu̇r·ə·kəs]
(embryology)
A cord or tube of epithelium connecting the apex of the urinary bladder with the allantois; its connective tissue forms the median umbilical ligament.
References in periodicals archive ?
Complex mucinous cystadenoma of undetermined malignant potential of the urachus.
Stage 0 mucinous adenocarcinoma in situ of the urachus.
Pseudomyxoma peritonei due to mucinous cystadenocarcinoma in situ of the urachus presenting as an inguinal hernia.
Patent urachus is a rare anomaly, with an incidence of 1-2.
Antenatally the differential diagnosis of patent urachus includes pseudo-cyst (degeneration of Wharton's jelly), allantoic cyst , omphalo-mesentric duct cysts, anterior abdominal wall defects, vascular lesions of the umbilical cord and bladder exstrophy.
Although the association between a patent urachus and bladder outlet obstruction is low, obstruction needs to be excluded either preoperatively by micturating cystourethrogram, or by intraoperative cystoscopy (4,5,6,7).
The anatomic position of the urachus becomes important when considering the presentation of patients with urachal disease.
Disease of the urachus simulating intra-abdominal disorders.
Although the urachus is normally lined by transitional epithelium, almost 90% of urachal tumours are adenocarcinomas, 75% of which are mucin producing.
4) Urachal tumours arise in the juxtavesical portion of the urachus and extend inferiorly into the bladder and superiorly towards the umbilicus.