<prompt> Most common anomaly of upper urogenital tract isUretero pelvic junction stenosisEctopic uretheral openingUreteroceleEctopic ureter  <response>: The most common obstructed lateral fusion defects is unilateral obstruction and is most commonly seen in women with complete duplication of the reproductive tractdouble uterus, cervix and vagina . Unilateral UPJ obstruction is the most common prenatally detected obstructive disease, often picked up on maternal ultrasounds during pregnancy. Reference: GHAI Essential pediatrics, 8th edition 