Computed tomography in the diagnosis of intracranial meningioma.

The CT findings in 53 meningiomas are reported. Based upon the plain and post-contrast CT pattern and density characteristics, the diagnosis of meningioma was accurately predicted in 28 of 35 convexity, parasagittal, subfrontal, middle fossa and sphenoid wing lesions (80%). In 2 calcified nonenhancing meningioma, the diagnosis was suspected by CT findings. CT was extremely accurate in detecting 16 juxtasellar, intraventricular, tentorial and posterior fossa meningiomas, but the CT pattern was less specific such that differentiation from other neoplastic or vascular lesions was not always possible. There were only 2 false negative cases; these occurred when contrast infusion had not been performed.