Syringomyelia & Spinal Cord Effects
Non-communicating syringomyelia
Non-communicating syringomyelia is a syrinx that does not connect with the cerebrospinal fluid spaces, the form typically associated with Chiari malformation.
In short: Non-communicating syringomyelia
- It is a syrinx that does not connect with the CSF spaces.
- It typically forms within the cord substance, separate from the central canal.
- It is the form usually associated with Chiari malformation.
- It often responds to relieving the CSF obstruction.
What it is
Non-communicating syringomyelia is a form of syrinx that does not directly connect with the cerebrospinal fluid spaces — it forms within the substance of the spinal cord, separate from the central canal's connection to the ventricles. It is the form typically associated with Chiari malformation.
Understanding Non-communicating syringomyelia
In Chiari malformation, the syrinx is usually of the non-communicating type, forming within the cord in relation to the disrupted CSF dynamics at the craniocervical junction (rather than through a direct connection to the ventricles). The leading theories of syrinx formation in Chiari (such as the piston effect and pressure-related models) describe fluid being driven into the cord substance. Importantly, because the syrinx in Chiari is driven by the CSF obstruction at the foramen magnum, relieving that obstruction with decompression often causes the syrinx to shrink. Understanding non-communicating syringomyelia clarifies the form typically seen in Chiari and why addressing the craniocervical obstruction is the key treatment.
Why it matters
Understanding non-communicating syringomyelia helps families see that the Chiari-associated syrinx typically forms within the cord (not through a connection to the ventricles), and why relieving the craniocervical obstruction is the key to shrinking it.
Common questions
What is non-communicating syringomyelia?
A syrinx that does not connect with the CSF spaces.
Is it the form seen in Chiari?
Yes — typically.
Does it respond to treatment?
Often — relieving the craniocervical obstruction tends to shrink it.
Bottom line
Non-communicating syringomyelia is a syrinx within the cord not connected to the CSF spaces, the form typical of Chiari, which often shrinks after decompression.
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