Diffusion-Weighted MR Imaging in Posterior Ischemic Optic Neuropathy

MR imaging shows enhancing mucosal thickening in the left sinonasal complex on coronal postcontrast fat-saturated T1-weighted (A) and axial T2-weighted sequences (B). In addition, the T2-weighted image shows a bulky, enhancing left cavernous sinus with nonvisualization of left ICA flow void (suggesting thrombosis). A 3D time-of-flight MRA (C) shows absence of the left ICA and paucity of the branches of the left distal MCA. Sagittal (D) and axial (E) DW images show restriction in the posterior part of the intraorbital optic nerve (arrow). The ADC map (F) shows reduced ADC in the posterior part (arrow) and increased ADC in the anterior part, respectively.