OBSOLETE: Isolated megalencephaly

Isolated megalencephaly is a condition where the brain is abnormally large, meaning it weighs significantly more than expected for a person's age and sex. The term 'megalencephaly' literally means 'large brain.' In this isolated form, the enlarged brain occurs on its own without being part of a broader syndrome or associated with other major birth defects. It is important to note that this specific Orphanet entry (268920) has been marked as OBSOLETE, meaning the classification has been retired or merged into other, more specific diagnostic categories as medical understanding has advanced. Megalencephaly can range from a benign condition — sometimes called benign familial megalencephaly, where a child simply has a larger-than-average head and brain with normal development — to more concerning forms that may be associated with developmental delays, seizures, or other neurological problems. The brain overgrowth can sometimes lead to increased pressure inside the skull or difficulties with motor skills and learning. Because this entry is obsolete, patients and families who were previously given this diagnosis should work with their doctors to determine whether a more current and specific diagnosis applies. Modern genetic testing has helped reclassify many cases of megalencephaly into specific genetic conditions, such as those caused by mutations in the PI3K-AKT-mTOR signaling pathway. Treatment depends on the underlying cause and symptoms, and may include medications for seizures, physical therapy, occupational therapy, and regular monitoring of head growth and development.

Bring these to your next appointment

• Q1.Has a specific genetic cause been identified for my child's megalencephaly?,Should we pursue genetic testing, and if so, which type?,What developmental milestones should we be watching for?,Are there any clinical trials or targeted therapies available for our specific diagnosis?,How often should brain imaging (MRI) be repeated?,What early intervention services do you recommend?,Is this condition likely to be inherited, and should other family members be tested?

Common questions about OBSOLETE: Isolated megalencephaly

Related conditions

Other rare diseases commonly researched alongside OBSOLETE: Isolated megalencephaly.

• Hemimegalencephaly→