Mondo Description Pontocerebellar hypoplasia type 4 (PCH4) is a very rare form of PCH, characterized by prenatal onset of polyhydramnios and contractures followed by hypertonia, severe clonus, primary hypoventilation leading to an early postnatal death.

Uniprot Description A disorder characterized by an abnormally small cerebellum and brainstem, severe neonatal encephalopathy, microcephaly, myoclonus and muscular hypertonia. There is a severe inferior olivary and pontine neuronal loss and a diffuse white matter gliosis.

Disease Ontology Description A pontocerebellar hypoplasia that is characterized by progressive microcephaly, hypertonia, myoclonus, seizure and early lethality, has_material_basis_in autosomal recessive inheritance of mutation in the TSEN54 gene.