renal hypoplasia

re·nal hy·po·pla·si·a

an abnormally small kidney that is morphologically normal but has either a reduced number of nephrons or smaller nephrons.

re·nal hy·po·pla·si·a

(rē'năl hī'pō-plā'zē-ă) An abnormally small kidney that is morphologically normal but has either a reduced number of nephrons or smaller ones.