Pontocerebellar Hypoplasia, Type 5, also known as pontocerebellar hypoplasia type 5, is related to pontocerebellar hypoplasia, type 4 and pontocerebellar hypoplasia, type 2a. An important gene associated with Pontocerebellar Hypoplasia, Type 5 is TSEN54 (TRNA Splicing Endonuclease Subunit 54). Affiliated tissues include cerebellum and pons, and related phenotypes are seizure and microcephaly