urachus


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Related to urachus: patent urachus

urachus

(ˈjuːrəkəs)
n
(Pathology) a cord of tissue connecting a fetus's bladder to the umbilical cord
References in periodicals archive ?
The urachus, a midline tubular structure, represents an embryologic remnant of the allantois, the cephalic extension of cloaca that connects the anterior dome of the bladder and the umbilicus.
Patient 4: In the prenatal 27th week, bilateral multicystic kidney, megaureter and patent urachus were detected.
Grasping the median umbilical ligament (Urachus) with downward traction and cutting it will open the space of Retzius.
These include unilateral VUR with renal dysplasia, and the presence of urachus, ascites, urinoma and bladder diverticula.
(1,2,6,9,11) Rarely, JB/PMP has been associated with malignant tumors of the rectum, colon, small intestine, pancreas, stomach, gallbladder, bile ducts, fallopian tubes, urachus, urinary bladder, breast, and lung.
The urachus is a midline tubular structure that stretches from the apex of the bladder and connects to the umbilicus.
The urachus is a remnant of the fetal structure connecting the allantois and the fetal bladder.
Although transitional epithelium usually lines the urachus, most urachal tumors are adenocarcinomas (90%) and represent 20%-40% of all primary bladder adenocarcinomas [1].
[10, 11] The etiology of PUE remains unclear; however, several etiological theories have been proposed: these include coelomic metaplasia of the urachus remnant; direct extension through the round ligament; or congenital presence of developmentally displaced endometrial tissue.
At birth, this structure consists of paired umbilical arteries, a single umbilical vein and urachus. Following a normal delivery, the smooth muscle that surrounds the umbilicus contracts in response to stretching of cord at parturition.
Urachal carcinoma is a rare cancer arising from the remnant epithelial tissue of the urachus and reportedly has a predilection for the dome of the bladder, but, in some patients, it arises from the urachal remnant of the abdominal wall.