Bony Decompression for Chiari Malformation Type I: Long-Term Follow-Up

Area of Science:

• Neurosurgery
• Pediatric Neurosurgery
• Chiari Malformation Management

Background:

• Chiari malformation type I (CM-I) management involves various surgical techniques.
• Bony posterior fossa decompression is a common pediatric approach but may have a higher reoperation risk.
• Limited long-term follow-up data exists for bony decompression alone in pediatric CM-I.

Purpose of the Study:

• To evaluate the long-term effectiveness of suboccipital craniectomy alone for pediatric CM-I.
• To assess the safety and durability of this surgical approach in children.

Main Methods:

• Retrospective review of 42 children (mean age 6.7 years) undergoing bony decompression (suboccipital craniectomy, with C1 laminectomy and/or dural delamination in select cases).
• Outcome assessment using traditional measurements and the Chicago Chiari Outcome Scale (CCOS).
• Mean follow-up of 11.3 years (range 5-15 years).

Main Results:

• Headache (81%), neck pain (40%), and vertigo (40%) were common preoperative symptoms; 45% had syringomyelia.
• Symptom resolution or significant improvement occurred in 58% of patients.
• Excellent or functional outcomes (CCOS) were achieved in 98% of children, with a 7% reoperation rate for recurrence and no complications.

Conclusions:

• Suboccipital craniectomy alone provides effective, safe, and durable treatment for pediatric CM-I.
• The low complication rate and high success rate outweigh the risk of recurrence.
• Careful patient selection is critical for optimal outcomes in CM-I surgery.