Persistent / recurrent syrinx (post-op)

What it is

A persistent or recurrent syrinx after surgery is a syrinx that does not shrink (persistent) or that returns after improving (recurrent) following decompression. It may require further evaluation or treatment to address.

Understanding Persistent / recurrent syrinx (post-op)

While most syrinxes shrink after decompression, some persist or recur. This can happen if the CSF obstruction was not fully relieved, if scar tissue (adhesions) re-obstructs flow, or in more complex situations (such as Chiari 1.5, where a syrinx is more likely to persist). A persistent or recurrent syrinx is identified on follow-up imaging and prompts evaluation — including CSF flow studies — to find the cause. Depending on the findings, treatment may involve a revision decompression (to better relieve the obstruction or address scarring) or a syrinx-specific procedure (such as a syringosubarachnoid shunt) if decompression alone is insufficient. Addressing a persistent or recurrent syrinx is important to prevent ongoing cord damage. Understanding this clarifies that some syrinxes need additional attention after surgery and what options exist.

Why it matters

Understanding persistent/recurrent syrinx after surgery helps families see that, while most syrinxes shrink, some need further evaluation or treatment — important to prevent ongoing cord damage.