Paraneoplastic encephalitis associated with myasthenia gravis and malignant thymoma.

We present a patient with type B2 thymoma (World Health Organization Thymoma Classification) with the complications of anti-muscle acetylcholine receptor antibody-positive myasthenia gravis and anti-voltage-gated potassium channel antibodies associated with paraneoplastic encephalitis. A timing difference between the onset of these neurological disorders and a dissociation of clinical symptoms was observed during the disease. This report alerts clinicians that long-term follow-up is needed where patients have a residual thymoma and attention should be paid to other concomitant autoimmune disorders.