, 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
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.
is a midline tubular structure that stretches from the apex of the bladder and connects to the umbilicus.
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 .
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.