Most common anomaly of upper urogenital tract is -

Ans. is 'a' i.e., Uretero pelvic junction stenosis o UPJ stenosis is most common abnormality in childhood and is more frequent in male children, characterised by narrowing usually on left side.o Overall, position & shape of kidney being most common one.o Horse shoe kidney is the most common and most frequently found renal abnormality among men.