Idiopathic intracranial hypertension: Imaging and clinical fundamentals

Figure 8 Optic nerve sheath distension. A and B: Axial (A) and coronal T2-weighted magnetic resonance images (B) at the level of the globes and optic nerves in a patient with no idiopathic intracranial hypertension signs or symptoms are provided for reference. Note the normal caliber and diameter of the optic nerve sheaths (arrows); C and D: Axial (C) and coronal T2-weighted magnetic resonance images (D) at the level of the globes and optic nerves in a patient with signs and symptoms of idiopathic intracranial hypertension demonstrate increased caliber of the optic nerve sheaths (arrows) (diameter > 8-9 mm) as a result of cerebrospinal fluid distension.