MRI Characterization of Vascular Spinal Tumors

Area of Science:

• Radiology
• Neurosurgery
• Oncology

Background:

• Accurate identification of vascular spinal tumors via MRI is crucial for effective preoperative planning, including angiography and preoperative embolization (PE), to minimize hemorrhage and improve patient outcomes.
• However, the reliability of MRI-based characterization for these tumors has not been well-established.

Purpose of the Study:

• To describe practical magnetic resonance imaging (MRI) characteristics for identifying vascular spinal tumors.
• To evaluate the reliability and accuracy of these MRI characteristics among spine surgeons and musculoskeletal radiologists.

Main Methods:

• A retrospective study compared MRI characteristics (T2 hyperintensity, contrast enhancement, flow voids, feeding vessels) in 20 vascular and 20 nonvascular spinal tumors.
• Blinded review of MRI scans was performed by 7 spine surgeons and 5 musculoskeletal radiologists, assessing four criteria and recommending preoperative embolization (PE).

Main Results:

• Both surgeons and radiologists demonstrated moderate accuracy in identifying vascularity, with varying sensitivity and specificity for individual criteria.
• Radiologists showed higher sensitivity but lower specificity compared to surgeons for most criteria.
• Low interobserver and intraobserver reliability (κ and intraclass correlation values) were observed for both groups.

Conclusions:

• MRI characterization of vascular spinal tumors has limited interobserver and intraobserver reliability, despite using simplified criteria.
• A significant 33% false-negative rate for recommending angiography/PE was found in both surgeons and radiologists.
• Angiography may need to be considered more routinely in the workup of spinal tumors due to the limitations of MRI-based vascularity assessment.