Orphanet: Megalencephalic leukoencephalopathy with subcortical cysts

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.

Orphanet doesn't provide personalised answers. To get in touch with the Orphanet team, please contact

Information provided in your contribution (including your email address) will be stocked in .CSV files that will be sent as an email to Orphanet's teams. These emails might be conserved in the teams' mailboxes, in our backoffice servers but will not be registered in our databases (for more information see our section General Data Protection Regulation and data privacy (GDPR) and Confidentiality).

Captcha image

Megalencephalic leukoencephalopathy with subcortical cysts

Disease definition

A form of leukodystrophy that is characterized by infantile-onset macrocephaly, often with mild neurologic signs at presentation (such as mild motor delay), which worsen with time, leading to poor ambulation, falls, ataxia, spasticity, increasing seizures and cognitive decline. Brain magnetic resonance imaging reveals diffusely abnormal and mildly swollen white matter as well as subcortical cysts in the anterior temporal and frontoparietal regions.


Classification level: Disorder
  • Synonym(s):
    • MLC
    • Megalencephalic leukodystrophy
    • Megalencephaly-cystic leukodystrophy syndrome
    • Vacuolating megalencephalic leukoencephalopathy with subcortical cysts
    • Van der Knaap syndrome
  • Prevalence: <1 / 1 000 000
  • Inheritance: Autosomal dominant or Autosomal recessive 
  • Age of onset: Infancy, Neonatal
  • ICD-10: E75.2
  • OMIM: 604004  613925  613926
  • UMLS: C1858854
  • MeSH: -
  • GARD: 3445
  • MedDRA: -

Detailed information


Disease review articles

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