Abstract
Cranial navigation techniques assist neurosurgeons in localizing the pathology during operation. These techniques require magnetic resonance imaging for registration before surgery and there has been some difficulty for applying to corticotomy following invasive monitoring. The authors have applied this technique to the resection of seizure foci following invasive monitoring and one representative case of parietal lobe epilepsy was reported. Before implantation of intracranial electrodes, magnetic resonance imaging was obtained with fiducial markers on the scalp. To avoid shift of fiducial markers, these were placed far enough from skin incision and rigidly fixed to the scalp. During resection of seizure foci, resection of epileptogenic cortex was accomplished according to the result of cortical mapping and the guidance of cranial navigation. Potential hazards included brain shift due to cerebrospinal fluid loss and the mass effect of subdural grid electrodes.
