Presentation
MRI done for chronic headache workup.
From the case:
Chiari I malformation
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In the midsagittal MRI, the posterior fossa is small. The so called peg-like cerebellar tonsils are located well below the level of foramen magnum. Tonsilar sulci have the configuration of Sargeant Stripe.
Syringohydromyelia is also noted in the upper cervical spinal cord.