MR of postoperative syringomyelia

Area of Science:

• Neurosurgery
• Radiology
• Neurology

Background:

• Syringomyelia is a condition characterized by fluid-filled cavities within the spinal cord.
• It can be associated with Chiari I malformation, trauma, or be idiopathic.
• Surgical interventions aim to alleviate pressure and facilitate cerebrospinal fluid (CSF) flow.

Purpose of the Study:

• To evaluate the effectiveness of different surgical treatments for syringomyelia using Magnetic Resonance (MR) imaging.
• To correlate imaging findings with clinical outcomes.
• To discuss proposed mechanisms of syrinx formation and extension in relation to surgical procedures.

Main Methods:

• Retrospective review of 27 MR scans from 20 patients surgically treated for syringomyelia.
• Analysis of surgical procedures including shunts, myelotomies, and foramen magnum decompressions.
• Assessment of shunt visibility and syrinx collapse on MR imaging, and CSF flow visualization after foramen magnum decompression.

Main Results:

• Shunt catheters were visualized in 75% of treated patients, with adequate shunting resulting in syrinx collapse and no flow void.
• Foramen magnum decompression was visualized on MR in all nine patients who underwent the procedure.
• Poor clinical outcomes after foramen magnum decompression correlated with the absence of visible CSF flow between the foramen magnum and posterior fossa neural structures.

Conclusions:

• Surgical treatment, particularly shunting, can effectively manage syringomyelia, evidenced by syrinx collapse on MR imaging.
• Visualization of CSF flow after foramen magnum decompression is a critical indicator of successful treatment and positive clinical outcomes.
• Imaging plays a crucial role in assessing the efficacy of surgical interventions for syringomyelia.