[Congenital mesoblastic nephroma in the adult].

Congenital mesoblastic nephroma is a benign neoplasm of the kidney which is usually diagnosed during the first three months of life. We report herein a case of mesoblastic nephroma in a 69 year-old man. At this age, diagnosis can only be made by histopathologic examination of the operative specimen. This was the case for our patient and the five other cases reported in the literature. Histogenesis of mesoblastic nephroma is open to debate: mesenchymal origin for some authors, tumor of the blastema for most of the others.