Primary Outcome Measures:
- Evaluation of the heritability of renal HYPODYSPLASIA (on the renal ultra sound) and DNA collection to make possible identification of predisposing genes [ Time Frame: the same day ]
DNA collection from the propositus and its parents and in case of families with more than one affected member, collection of DNA from the all family.
DNA collection from the propositus and its family. A questionnaire will be filled by the parents to seek other affected individual in the family.With another affected member, DNA collection will be collected from the whole family.
A renal ultrasound will be prescribed for the parents, brothers and sisters.