A<unk> , also known as a retrocaval ureter, is a rare congenital malformation of the right human ureter, in which the ureter passes behind the inferior<unk> <unk> , causing compression possibly leading to hydronephrosis. The prevalence of this condition is approximately 1 per 1,000 persons, with males 2-3 times more likely than females to develop the condition. Symptoms often do not manifest until those with the condition are aged in their 20s or 30s.
Preureteric vena cava
Caliber persistent artery
Subclavian loop
Meckelian groove
Portal vein
Major aortopulmonary collateral artery
Necklace of Venus
Nicomachus 