[Congenital mesoblastic nephroma]. / Nefroma mesoblástico congénito.

Authors report three cases of congenital mesoblastic nephroma. In two of them, diagnosis was neonatal, while the third was made at the 3rd-month. They discuss diagnostic procedures employed as well as pathological findings. Presence of a mass was the first clinical sign in all three cases. Nephrectomy was the only treatment employed, with favourable outcome.