Congenital renal arteriovenous malformation (aneurysmal type) in childhood.

We report on a 9-year-old boy with a congenital renal arteriovenous fistula of the aneurysmal type, a form previously not observed in childhood. The clinical picture was unusual with severe arterial hypertension, excessive polyuria and decreased levels of serum sodium and chloride as main signs. Clinical and biochemical findings normalised after nephrectomy of the kidney involved.