Gelastic epilepsy, hypothalamic hamartoma, precocious puberty, and agenesis of the corpus callosum: a new association.

We describe a boy who has gelastic epilepsy, precocious puberty, hypothalamic hamartoma, and agenesis of the corpus callosum. We believe that this is the first documented case in which agenesis of the corpus callosum has been associated with hypothalamic hamartoma and gelastic epileptic syndrome in a child.