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Severe neonatal-onset encephalopathy with microcephaly

Disease definition

Severe neonatal-onset encephalopathy with microcephaly is a rare monogenic disease with epilepsy characterized by neonatal-onset encephalopathy, microcephaly, severe developmental delay or absent development, breathing abnormalities (including central hypoventilation and/or respiratory insufficiency), intractable seizures, abnormal muscle tone and involuntary movements. Early death is usual.

ORPHA:209370

Classification level: Disorder
  • Synonym(s):
    • Severe congenital encephalopathy due to MECP2 mutation
  • Prevalence: <1 / 1 000 000
  • Inheritance: X-linked recessive 
  • Age of onset: Infancy, Neonatal
  • ICD-10: Q02
  • ICD-11: LD20.2
  • OMIM: 300673
  • UMLS: C4749821
  • MeSH: -
  • GARD: -
  • MedDRA: -

  A summary on this disease is available in Español (2018) Français (2018) Italiano (2018) Nederlands (2018)

Detailed information

General public

  • Article for general public
  • Español (2022) - Asociación Nacional de Personas con Epilepsia-ANPE

Disease review articles

ERN produced/endorsed by ERN(s)   FSMR produced/endorsed by FSMR(s)

Additional information

Further information on this disease

Patient-centred resources for this disease

Research activities on this disease

Specialised Social Services

Newborn screening

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.