- General
- The term C-0 was introduced because symptoms and associated syrinx (a fluid-filled cyst within the spinal cord) in these patients improved after a standard Chiari operation, even though their cerebellar tonsils were at or above the foramen magnum.
- Definition
- Crowded foramen magnum, but specifically exists without tonsillar herniation.
- Association features
- C-0 is associated with hydromyelia (or syringomyelia).
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