CASE REPORT Acute Optic Nerve Infarction Demonstrated by Diffusion-Weighted Imaging in a Case of

SUMMARY: A 60-year-old woman developed right-eye vision loss secondary to rhinocerebral mucor-mycosis. Routine MR imaging sequences including enhanced MR imaging showed normal optic nerves, but a diffusion-weighted sequence and apparent diffusion coefficient maps revealed markedly restricted diffusion in the right optic nerve. This MR imaging abnormality of optic nerve infarction due to mucormycosis has not been reported previously. A60-year-old woman presented with swelling and rednessof the right eye for 14 days. She denied any vision loss or any history of eye trauma. Her medical history was significant for diabetes mellitus and myelodysplastic syndrome. Exami-nation of the right eye on day 1 was remarkable for proptosis, conjunctival injection, and restricted extraocular motility in all directions. Visual acuity and findings of a fundus examina-tion were completely normal, as was the left eye. Her white blood cell count was 4000/cubic millimeter, and her blood sugar level was 200 mg/dL. CT showed mucosal thickening compatible with sinusitis involving the right maxillary, fron