Orphanet: Pontocerebellar hypoplasia type 3

Search for a rare disease

* (*) mandatory field

Other search option(s)

Suggest an update

(*) Required fields.


Only comments seeking to improve the quality and accuracy of information on the Orphanet website are accepted. For all other comments, please send your remarks via contact us. Only comments written in English can be processed.

Captcha image

Pontocerebellar hypoplasia type 3

Disease definition

Pontocerebellar hypoplasia type 3 (PCH3), also known as cerebellar atrophy with progressive microcephaly (CLAM) is a rare form of pontocerebellar hypoplasia (see this term) with autosomal recessive transmission characterized neonatally by hypotonia and impaired swallowing and from infancy onward by seizures, optic atrophy and short stature, but none of the clinical findings are specific for PCH3.


Classification level: Disorder
  • Synonym(s):
    • CLAM
    • Cerebellar atrophy with progressive microcephaly
    • PCH with optic atrophy
    • PCH without dyskinesia
    • PCH3
  • Prevalence: <1 / 1 000 000
  • Inheritance: Autosomal recessive 
  • Age of onset: Infancy, Neonatal
  • ICD-10: Q04.3
  • OMIM: 608027
  • UMLS: C1842687
  • MeSH: C548072
  • GARD: 10708
  • MedDRA: -

Detailed information


The documents contained in this web site are presented for information purposes only. The material is in no way intended to replace professional medical care by a qualified specialist and should not be used as a basis for diagnosis or treatment.