What is White matter hypoplasia, corpus callosum agenesia, and mental retardation?

• White matter hypoplasia, corpus callosum agenesia, and mental retardation: A syndrome which is characterised by white matter hypoplasia, corpus callosum agenesia, and mental retardation. White matter hypoplasia, corpus callosum agenesia, and mental retardation is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that White matter hypoplasia, corpus callosum agenesia, and mental retardation, or a subtype of White matter hypoplasia, corpus callosum agenesia, and mental retardation, affects less than 200,000 people in the US population.  more