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The medical information on this site is provided as an information resource only, and is not to be used or relied on for any diagnostic or treatment purposes. This information is not intended to be patient education, does not create any patient-physician relationship, and should not be used as a substitute for professional diagnosis and treatment.
Hemimegalencephaly
Overview
Hemimegalencephaly is a rare malformation involving one side of the brain. It may occur alone or in association with epidermal nevus syndrome, Proteus syndrome, or Klippel-Trenaunay syndrome. It usually causes partial epilepsy, which may be treated with hemispherectomy. Hemimegalencephaly can also cause intellectual disability and impair normal movement on the side of the body opposite of the malformation. Symptoms range from mild to severe. The cause of this condition is not fully understood, but involves a disturbance of cells early in development and likely involves genes involved in patterning and symmetry.
Source: Genetic and Rare Diseases Information Center (GARD), supported by ORDR-NCATS and NHGRI.
Trusted Medical Sites
Genetic & Rare Diseases Information Center (GARD)
GARD provides the public with access to current, reliable, and easy-to-understand information about rare or genetic diseases in English or Spanish.
Support Organizations
Support organizations can provide help and guidance in areas such as peer matching, education and training, and therapy and counseling.