“ This is the most commonly diagnosed Chiari malformation. Usually prenatal or neonatal diagnosis with myelomeningocele, enlarging head and...
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This is the most commonly diagnosed Chiari malformation. Usually prenatal or neonatal diagnosis with myelomeningocele, enlarging head and neurological signs. Folate supplementation has reduced incidence. Overall problem is a small posterior fossa with herniation of the hindbrain.
MRI
• Thoracolumbar myelomeningocele (95%), obstructive hydrocephalus (90%), callosal dysgenesis (85%), tectal beaking, low-lying ‘towering’ cerebellar tonsils, small posterior fossa, elongated fourth ventricle.
• Other findings include an absent septum pellucidum, excessive cortical gyration and wrapping of the cerebellum around the brainstem (‘banana sign’).
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