choroid plexectomy /pleksek″təmē/ [Gk, chorion + eidos + L, plexus, pleated; Gk, ektomē, excision] , a surgical procedure for the reduction of cerebrospinal fluid production in the ventricles of the brain in hydrocephalus, usually in the newborn. The procedure involves transcortical entry of the lateral ventricles to coagulate or to excise the choroid plexuses and seeks to correct a communicating type of hydrocephalus.