A so called “subdural haematoma” actually develops in the dural border cell layer, which belongs to the dura; a true intralaminar dural haematoma to our knowledge has not been reported.

A 29 year old right handed man presented with a 14 year history of intractable epilepsy, which did not respond to major antiepileptic drugs. He usually felt an epigastric rising sense as an aura, then stared blankly, and showed oroalimentary automatism. Postictal confusion persisted for several hours. The frequency of attacks ranged from several times a month to several times a day, and he had been taking phenytoin, phenobarbitone, and vigabatrin. During childhood, he had had severe febrile seizures.

No neurological deficit was found on detailed physical examination. Brain MRI (1.5 T) disclosed bilateral hippocampal and diffuse cortical atrophy, and sharp waves were seen in the right anterior temporal region on interictal EEG. Prolonged video-EEG monitoring, however, showed sharp waves in the right temporal region and slowing in the left temporal region. Interictal single photon emission tomography (SPECT) did not show asymmetry between the two temporal lobes. Preoperative routine laboratory examination, including a coagulation …