Fig. 4From: Magnetic resonance imaging indicator of the causes of optic neuropathy in IgG4-related ophthalmic diseaseCompression of optic nerve as hypertrophic cranial pachymeningitis. Coronal contrast enhanced T1-weighted MRI (a) showing hyperintense linear dura thickening (arrow heads). Sagittal contrast enhanced T1-weighted MRI (b) showing the thickened dura mater was markedly enhanced after contrast media, and compressed the optic nerve in the orbit apex (white arrow)Back to article page