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Susac syndrome with frontal intermittent rhythmic delta activity (FIRDA)
Danielle Woolridge1, Mark Stefanelli, Barbara Hoppe
1Memorial University of Newfoundland, St. John's, NL, Canada.
Background:
Susac syndrome is a rare condition involving the brain, retina, and cochlea. Electroencephalogram (EEG) findings from published case reports show mainly generalized slowing.
Case Report:
A 30-year-old man presented with acute onset of superior vision loss, unsteady gait, and hearing loss. This was accompanied by short-term memory loss and behavioral and mood changes. MRI showed multiple white matter hyperintensities. The EEG showed frontal intermittent rhythmic delta activity. A diagnosis of Susac syndrome was made and treatment with methylprednisolone, ASA, and Nimodipine was instituted. At one-year follow-up, bilateral hearing loss, mild visual impairment, and mood changes were still apparent.
Conclusions:
Frontal intermittent rhythmic delta activity can be seen in Susac syndrome.
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