A Case of Susac Syndrome

摘要

A 32-year-woman presented with mild encephalopathy, unsteady gait and instability, history of bilateral deafness, and bilateral visual changes. Magnetic resonance imaging of the brain demonstrated multiple hyperintensities involving the corpus callosum (Figure 1). There was no cord signal abnormality on imaging studies of the spinal cord. Imaging studies of the cervical and intracranial vasculature showed no evidence of vasculitis. Cerebrospinal fluid markers for inflammation and demyelination were negative, including oligoclonal bands. Visual evoked potentials were within normal limits. Extensive laboratory testing including Lyme antibody titers was unremarkable. Ophthalmology referral confirmed bilateral branch retinal artery occlusions. The patient was also referred for audiography evaluation, which confirmed bilateral hearing loss. These symptoms, retinal and audiographic examination, and imaging study findings were consistent with a diagnosis of Susac syndrome. Susac syndrome is an immune-mediated endotheliopathy characterized by the triad of encephalopathy, cochlear hearing loss, and retinal artery occlusions diagnosed by clinical examination supported by pathognomonic corpus callosum involvement on magnetic resonance imaging. The patient was initially treated with corticosteroids, but these were discontinued following resolution of symptoms, as Susac syndrome is a self-limiting condition. Should she experience recurrence of symptoms, options for therapy include a combination of immunosuppres-sive agents such as corticosteroids, intravenous immunoglobu-lin, methotrexate, mycophenolate, and cyclosphosphamide.