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Tethered spinal cord usually does not cause headaches. What all tests has he undergone?
Was a magnetic resonance imaging (MRI) AND CT scan of head done?
Please refer to the link below.
http://www.boston-neurosurg.org/publications/faq/tethered_cord_MP.shtml
This hospital is doing some pioneering work in the filed of tethered spinal cord in children.