Experimental Factor Ontology identifier EFO_0010636 (pontocerebellar hypoplasia type 13) is a form of pontocerebellar hypoplasia, a disorder characterized by structural defects of the pons and cerebellum, evident upon brain imaging. PCH13 is an autosomal recessive form characterized by delayed psychomotor development, absent speech, severe intellectual disability and postnatal microcephaly, with brain malformations consisting of cerebellar atrophy and hypoplastic corpus callosum. Additional features, including seizures and visual impairment, are variable.