Increased mirror movements after epileptic seizure in a case of polymicrogyria

Background: Mirror movements (MM) are involuntary movements during the voluntary movements of the contralateral homologous body parts. Review Summary: We report a patient with an increase in MM after suffering an epileptic seizure of his upper and lower limbs due to the right frontoparietal polymicrogyria, including the supplementary motor area as evidenced by magnetic resonance imaging. MM have been investigated using transcranial magnetic stimulation and other electrophysiological techniques in our case. Conclusion: This case is notable in that it is the first recorded observation of a patient manifesting mirroring after apparently suffering an epileptic seizure. In our case, we suggest that epileptic seizure increases MM by inducing cortical reorganization.