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.
Although transitional epithelium usually lines the
urachus, most urachal tumors are adenocarcinomas (90%) and represent 20%-40% of all primary bladder adenocarcinomas [1].
Urachus is a fibrous remnant of the urogenital sinus and allantois.
[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.