obstructive hydrocephalus or syringomyelia may also be seen because of direct mechanical blockage of normal CSF flow.
Clinical signs of syringomyelia secondary to occipital hypoplasia are usually recognized between 6 months and 3 years of age.
It is often accompanied by a condition known as syringomyelia in which pockets of CSF form in the spinal cord.
Of those with Type I malformation, approximately 25 percent also have syringomyelia.
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