hemimegalencephaly https://rarediseases.info.nih.gov/diseases/2637/hemimegalencephaly https://www.malacards.org/card/hemimegalencephaly UMLS:C0431391 MONDO:0020492 NCIT:C177779 NANDO:1200563 Orphanet:99802 Hemimegalencephaly is a rare cerebral malformation characterized by overgrowth of all or part of a cerebral hemisphere, often with ipsilateral severe cortical dysplasia or dysgenesis, white matter hypertrophy and dilated lateral ventricle, presenting in early infancy with progressive hemiparesis, severe psychomotor retardation and intractable seizures. Hemimegalencephaly may be an isolated finding or associated with other syndromes such as angioosteohypertrophic syndrome, epidermal nevus syndrome and Ito hypomelanosis. Management includes seizure control by antiepileptic medications and early hemispherectomy. icd11.foundation:961229160 GARD:0002637 unilateral megalencephaly macrencephaly ICD9:742.4 MEDGEN:140910 NORD:1220 SCTID:253170008 MESH:D065705 overgrowth syndrome and/or cerebral malformations due to abnormalities in MTOR pathway genes