| 1. Syringomyelia with fourth ventricle median aperture obstruction and central canal dilation ① Associated with Chiari malformation type I; ② With posterior fossa cyst, tumor, arachnoiditis, etc., causing fourth ventricle median aperture obstruction. |
| 2. Idiopathic syringomyelia. |
| 3. Secondary syringomyelia Due to spinal cord tumor, trauma, spinal arachnoiditis, and meningitis. |
| 4. Simple spinal hydromyelia or with hydrocephalus. |
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