Interventricular fibroma and cystic renal dysplasia in a newborn.

A newborn twin presented with a cardiac tumor; at autopsy microcystic dysplasia was found in the kidneys. The histology of the renal cysts were not unlike those found in many multisystem syndromes (e.g., Schwartz-Jampel, Ehlers-Danlos, and Jeune's asphyxiating thoracic dystrophy). No evidence of tuberous sclerosis or other phakomatoses were found. This case may alert other observers to carefully look for cystic dysplasia of the kidneys or other organs in association with cardiac tumors.