Idiopathic Hypertrophic Pachymeningitis Mimicking Meningioma with Occlusion of Superior Sagittal Sinus: Case Report and Review of Literature

Idiopathic hypertrophic pachymeningitis is a rare inflammatory condition with diffuse thickening of the dura mater, which may cause a compressive effect or vascular compromise. A 40-year-old Chinese man presented with persistent headache for 6 months and a sudden epileptic seizure 2 days ago. Magnetic resonance imaging demonstrated a large (71 × 34 × 27 mm) extra-axial mass at the right frontal convexity with severe edema mimicking meningioma....