Abstract
We describe a 21-year-old woman with bipolar disorder who started taking lamotrigine 2 months ago who presented with fever and weakness. Physical examination revealed an erythematous rash over the right thenar eminence, as well as proximal muscle weakness in bilateral upper and lower extremities. Magnetic resonance imaging of the lower extremities showed patchy bilateral enhancing myositis. Right quadriceps muscle biopsy revealed inflammatory myopathy. Subsequent bone marrow biopsy demonstrated hemophagocytic lymphohistiocytosis. The patient started a prednisone taper for suspected inflammatory myositis and achieved full remission. This is one of the first descriptions of lamotrigine inducing an autoimmune response presenting as an inflammatory myositis.
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