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Duplicated ureter
Duplicated ureter or Duplex Collecting System is a congenital condition in which the ureteric bud, the embryological origin of the ureter, splits (or arises twice), resulting in two ureters draining a single kidney. It is the most common renal abnormality, occurring in approximately 1% of the population.〔Siomou E. et al, (Duplex collecting system diagnosed during the first 6 years of life after a first urinary tract infection: a study of 63 children ), Journal of Urology, 2006; 175(2):678-81; discussion 681-2〕〔J. Gatti, J. Murphy, J. Williams, H. Koo, emedicine overview, (Ureteral Duplication, Ureteral Ectopia, and Ureterocele )〕 The additional ureter may result in a ureterocele, or an ectopic ureter.
==Pathophysiology==
Ureteral development begins in the human fetus around the 4th week of embryonic development. A ureteric bud, arising from the mesonephric (or Wolffian) duct, gives rise to the ureter, as well as other parts of the collective system. In the case of a duplicated ureter, the ureteric bud either splits or arises twice. In most cases, the kidney is divided into two parts, an upper and lower lobe, with some overlap due to intermingling of collecting tubules. However, in some cases the division is so complete as to give rise to two separate parts, each with its own renal pelvis and ureter.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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