[Heterotopic gray matter: an infrequent cause of epilepsy].

Heterotopia of gray matter is a developmental malformation in which ectopic cortex is found in the white matter of the brain. A case of a 27-year-old woman with generalized convulsions is reported, including the results of cerebral computed tomography and magnetic resonance imaging. In this patient, nodular masses of gray matter were present in the periventricular region. We emphasize that magnetic resonance imaging is the current method of choice for diagnosing heterotopic gray matter.