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Extraaxial Lesions
A 75-year-old woman presenting with ataxia. Ax, axial; Cor, coronal; CT, computed tomography; FLAIR, fluid attenuated inversion recovery; Sag, sagittal.
A 51-year-old woman presenting with headaches and weakness of the right leg. Ax, axial; Cor, coronal; CT, computed tomography; FLAIR, fluid attenuated inversion recovery; Sag, sagittal.
A 73-year-old woman presenting with headaches, right hand tremor, and memory loss. Ax, axial; Cor, coronal; CT, computed tomography; FLAIR, fluid attenuated inversion recovery; Sag, sagittal.
A 72-year-old woman presenting with weakness of the left arm. Ax, axial; Cor, coronal; CT, computed tomography; FLAIR, fluid attenuated inversion recovery; Sag, sagittal.
DESCRIPTION OF FINDINGS
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Case A: A CT relatively hyperdense, T2 isointense, avidly enhancing extraaxial parasagittal right parietal lesion with thick dural enhancement, extensive surrounding white matter edema, and adjacent brain parenchymal enhancement, indicating parenchymal invasion.
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Case B: A large parasagittal left parietal extraaxial lesion with heterogeneous enhancement and cystic changes. Mild white matter edema is present anterior to the lesion without parenchymal enhancement.
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Case C: A large, densely enhancing left frontal extraaxial lesion with a large posterior cystic component. A large amount of parenchymal edema is present without parenchymal enhancement. A small cerebrospinal fluid cleft separating the lesion from the parenchyma is visible on the T2-weighted image.
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Case D: A large, T2 hypointense, densely enhancing right frontoparietal extraaxial lesion with a dural tail, adjacent hyperostosis, and patchy enhancement of the overlying bone.
Diagnosis
Case A
Malignant meningioma
Case B
Hemangiopericytoma
Case C
Typical cystic meningioma
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