Renal dysgenesis is a very broad term which can include any form underdevelopment of the kidneys. The spectrum includes:
- renal agenesis: complete lack of formation
- renal hypoplasia: partial lack of formation
Some authors also classify any form of renal maldevelopment affecting size, shape of function under this group.
Under this, various forms of renal dysplasia (renal maldevelopment) and other congenital renal anomalies also come under the group.