Dictionary.net

A monster whose brain is placed outside the skull, and seems to be supported on a pedicle, which traverses the summit of the skull. This state of monstrosity is termed Podanencepha'lia, or more properly, Podencepha'lia.-I. G. St. Hilaire.

Monster with the head held on by a mere pedicle.

A monster having a cerebral hernia through a cranial fissure and the brain contained in a pedunculated sac. [Gr.]