Interlayer dural split technique for Chiari I malformation treatment in adult-Technical note

Area of Science:

• Neurosurgery
• Spinal Cord Surgery
• Neurological Disorders

Background:

• Chiari Malformation Type I is a condition where brain tissue extends into the spinal canal.
• Syringomyelia, often associated with Chiari I, involves a fluid-filled cyst within the spinal cord.
• Traditional decompressive suboccipital craniectomy can be invasive.

Purpose of the Study:

• To introduce and evaluate an alternative surgical technique for Chiari I Malformation with syringomyelia.
• To assess the efficacy of an interlayer dural split technique, sparing the inner dura mater.

Main Methods:

• A series of three adult patients with Chiari I Malformation and mild-to-moderate syringomyelia underwent surgery.
• The technique involved a reduced suboccipital craniectomy and C1 posterior arch resection.
• A key step was incising only the outer dura mater and dissecting it from the inner layer, followed by autologous fascia duraplasty.

Main Results:

• All three patients experienced favorable postoperative courses with complete symptom resolution and no neurological deficits.
• Follow-up at 3, 6, and 12 months showed significant reductions in brainstem compression and syringomyelia.
• The interlayer dural split was observed to be less invasive than opening the dura.

Conclusions:

• The interlayer dural split technique is a potentially effective and less invasive surgical option for symptomatic adult Chiari I Malformation with mild-to-moderate syringomyelia.
• This method may offer advantages over standard decompressive craniectomy and C1 laminectomy.
• Further validation in larger case-control studies is warranted.