[pro″en-sef″ah-lus] a malformed fetus with a protrusion of the brain through a frontal fissure.
proencephalus
(prō″ĕn-sĕf′ă-lŭs) [Gr. pro, before, + enkephalos, brain] A deformed fetus in which the brain protrudes through a fissure in the frontal area of the skull.