pachymeningitis

Dural masses:

meningiomas and their mimics. IgG4-related hypertrophic pachymeningitis with skull invasion. a Post-contrast coronal T1-weighted MR image showing linear dural thickening and enhancement overlying the left cerebral convexity. Note that the overlying calvarial bone marrow signal is abnormal. b Apparent diffusion coefficient (ADC) map showing restricted diffusion in the lesion overlying the left parietal region. c Post-contrast axial T1-weighted image of the same lesion with enhancing soft tissue seen invading the skull. d Axial fluid attenuated inversion recovery (FLAIR) image showing the lesion is predominantly hypointense due to fibrosis with foci of hyperintensity

Anti-NMDAR

encephalitis with simultaneous hypertrophic pachymeningitis in a 68-year-old male: a rare case report. Magnetic resonance imaging of the brain: a thickening of dura mater localized at the left tentorium cerebelli, left cerebral hemisphere, and cerebral falx; the thickening dura mater was characterized by an intense contrast enhancement after the administration of gadolinium (a, b). Magnetic resonance venography: no obvious indication of the left internal jugular vein, and both of the left transverse sinus and the sigmoid sinus was slim with local stenosis; there was also increased cortical drainage in the left cerebral hemisphere (c)