Radiosurgical decompression of metastatic epidural compression

Area of Science:

• Neurosurgery
• Radiation Oncology
• Oncology

Background:

• Metastatic epidural compression (MEC) impacts ambulatory function.
• Spine radiosurgery offers precise tumor targeting and high-dose radiation for tumor control.
• A clinical trial was conducted to quantify radiosurgery's epidural decompression efficacy in MEC.

Purpose of the Study:

• To quantitatively assess the degree of epidural decompression achieved by radiosurgery in patients with metastatic epidural compression.
• To evaluate the effectiveness of radiosurgery in reducing epidural tumor volume and improving thecal sac patency.

Main Methods:

• Sixty-two patients with 85 MEC lesions underwent radiosurgery (median 16 Gy single session).
• Inclusion criteria included neurological status with muscle power 4/5 or better.
• Pre- and post-treatment imaging (MRI) and clinical follow-up were used to assess outcomes.

Main Results:

• Mean epidural tumor volume reduction was 65% at 2 months post-radiosurgery.
• Epidural tumor area decreased significantly (P < .001), and thecal sac patency improved from 55% to 76% (P < .001).
• Overall neurological function improved in 81% of patients.

Conclusions:

• Radiosurgery demonstrated significant epidural tumor decompression.
• This noninvasive approach is a viable alternative to surgical decompression and radiotherapy for malignant epidural compression in select patients.