Can CT and MRI features differentiate benign from malignant meningiomas?

Area of Science:

• Neurosurgery
• Radiology
• Oncology

Background:

• Meningiomas are primary tumors of the brain and spinal cord.
• Accurate preoperative grading of meningiomas is crucial for effective treatment planning.

Purpose of the Study:

• To evaluate the utility of magnetic resonance imaging (MRI) and computed tomography (CT) in distinguishing benign from high-grade meningiomas (WHO grade II and III) before surgery.
• To identify specific imaging characteristics indicative of higher-grade meningiomas.

Main Methods:

• A retrospective analysis of 71 patients with intracranial meningiomas was conducted.
• CT and MRI features were correlated with histopathological grades and operative findings using logistic regression.
• MRI's performance in detecting brain invasion was assessed against operative reports.

Main Results:

• High-grade meningiomas were associated with MRI features such as larger size, heterogeneous enhancement, necrosis, ill-defined margins, bone erosion, and brain invasion.
• Multivariate analysis identified brain invasion and intra-tumoral necrosis as significant predictors of high-grade meningiomas.
• Hyperostosis of the adjacent skull was the sole CT feature predicting low-grade meningiomas.
• MRI demonstrated 79% specificity and 20% sensitivity for detecting meningioma brain invasion.

Conclusions:

• MRI shows significant potential in predicting meningioma grade preoperatively.
• Preoperative grading using MRI can inform surgical planning and potentially reduce complications.
• Further research may refine MRI's role in meningioma management.