Pontocerebellar Hypoplasia, Type 11, also known as pch11, is related to pontocerebellar hypoplasia, type 2e and microcephaly. An important gene associated with Pontocerebellar Hypoplasia, Type 11 is TBC1D23 (TBC1 Domain Family Member 23). Affiliated tissues include brain and pons, and related phenotypes are spasticity and global developmental delay