Persistent or recurrent syrinx

What it is

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

Understanding Persistent or recurrent syrinx

While most syrinxes shrink after decompression, in some cases a syrinx persists or recurs — for example, if the CSF obstruction was not fully relieved, if scarring (arachnoid 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 prompts further evaluation, including imaging and CSF flow studies, to identify the cause. Management may involve a repeat or revision decompression, or a syrinx-specific procedure (such as a syringosubarachnoid shunt) if decompression alone is insufficient. Recognizing and addressing a persistent or recurrent syrinx is important to prevent ongoing cord damage. Understanding this clarifies that some syrinxes need additional attention and what options exist.

Why it matters

Understanding persistent or recurrent syrinx helps families see that, while most syrinxes shrink, some persist or return and need further evaluation or surgery — and why this is important to prevent ongoing cord damage.