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Dear Editor, Internuclear ophthalmoplegia (INO) results in the slowing, limitation, or inability of adduction of one eye, which is associated with nystagmus in the abducting eye and is caused by a lesion in the medial longitudinal fasciculus.1 A 39-year-old woman presented with sudden-onset vertigo, diplopia, and bilateral INO. Five years earlier she had developed subacute left-body numbness. Brain MRI at that time showed several small punctate T2-weighted hyperintensities in the periventricular and subcortical white matter, which were probably related to clinically and serologically suspected neurocysticercosis. She was treated with albendazole and corticosteroids. She developed symptomatic bradycardia during that hospitalization and a pacemaker was implanted. Four years prior to her current presentation she was admitted to our hospital with a 1-month history of new-onset headache, and was found to have a subarachnoid hemorrhage. Vascular imaging identified an intracranial dural arteriovenous fistula (DAVF) at the right sigmoid and transverse sinus junction. The DAVF was treated endovascularly and surgically. On examination she had impaired adduction of both eyes on lateral gaze, with horizontal nystagmus of the abducting eye and intact convergence, which was compatible with bilateral INO. She also had mild ataxia on the left side in both finger-nose-finger and heel-to-sheen testing, as well as difficulty performing tandem gait. The findings of neurological and general physical examinations were otherwise unremarkable. A vascular etiology was suspected due to the acuity of onset and her prior history of a DAVF after the endovascular and surgical interventions. The initial noncontrast head CT produced unremarkable findings. A digital subtraction cerebral angiogram showed occlusion of the right transverse and sigmoid sinuses and no new intracranial vascular lesion. Stroke, multiple sclerosis (MS), and infectious etiologies are the most common causes of bilateral INO.2,3 Brain MRI is the best tool for differentiating between ischemic stroke and MS, but the prior implantation of a non-MRI conditional pacemaker precluded MRI from initially being performed in our patient. An acute brainstem stroke manifests as areas of restricted diffusion in the arterial territory or a lacunar pattern. On the other hand, patients with MS usually have T2-weighted hyperintense (and possibly gadolinium-enhanced) lesions in the subcortical white matter, periventricular white matter, brainstem, and spinal cord. Cysticercosis usually presents in MRI as cystic or calcified lesions in the cortex or brainstem. Other diagnostic modalities that can aid the diagnosis of MS (e.g., CSF analysis for oligoclonal bands, visual evoked potentials, and somatosensory evoked potentials) are not as sensitive or specific as MRI. Nevertheless, we found that the opening pressure, cell counts, protein level, glucose level, veneral disease research laboratory results, and cultures were all within normal limits for the CSF of the present patient. Bardia Nourbakhsh Christian Cordano William Renthal

Determining the Etiology of Internuclear Ophthalmoplegia in a Patient with a Cardiac Pacemaker and Complex Neurological Presentation