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agenesis of the corpus callosum
Agenesis of the corpus callosum (ACC) is a rare birth defect (congenital disorder) in which there is a complete or partial absence of the corpus callosum. It occurs when the corpus callosum, the band of white matter connecting the two hemispheres in the brain, fails to develop normally, typically during pregnancy. The fibers that would otherwise form the corpus callosum become longitudinally oriented within each hemisphere and form structures called Probst bundles.
In addition to agenesis of the corpus callosum, other callosal disorders include hypogenesis (partial formation), dysgenesis (malformation) of the corpus callosum, and hypoplasia (underdevelopment) of the corpus callosum.〔(【引用サイトリンク】publisher=University of Maine )〕
==Diagnosis==
Callosal disorders can be diagnosed through brain imaging studies or during autopsy.〔(【引用サイトリンク】title=Corpus callosum disorders )〕 They may be diagnosed through an MRI, CT scan, Sonography, prenatal ultrasound, or prenatal MRI.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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