[Multiple subpial transection after lesionectomy in an intractable epilepsy case].

A Sixty-one-year-old man was admitted to our hospital because of generalized convulsion. He had suffered from intractable epilepsy for 26 years. CT and MRI showed the right frontal cavernous angioma. On operation, intraoperative electrocorticography was performed after lesionectomy including surrounding glial scar and hemosiderin laden tissue. It showed epileptiform potentials in neighbor gyrus of the lesion. Because the removed sphere would be so broad, and we performed multiple subpial transection (MST). After MST, depression of background electrical activity and disappearance of spike discharge are seen. One and half year after operation, seizure was controlled by only phenobarbital administration.