A congenital kidney abnormality is a problem with the kidney that is present at birth. Abnormalities range from abnormal structures, blocked urine flow, unusual position of the kidneys that impairs function, or even being born with only one kidney. If the problem is severe enough, kidney failure may result.Types of congenital abnormalities of kidneys
Absence of one kidney: Also called agenesis when there is absence of one kidney the corresponding ureter is also absent. In this case the single kidney increases to almost twice its normal size and takes over the function of two kidneys
Supernumary kidney: There may be more than one kidney on one or both sides.
Hypoplasia: When a kidney attains a smaller size than normal or functions less it is called hypoplasia.
