Presurgical three-dimensional magnetic source imaging of the somatosensory cortex in a patient with a peri-Rolandic lesion: technical note

Neurosurgery. 1994 May;34(5):930-3; discussion 933-4. doi: 10.1227/00006123-199405000-00027.


We report a case in which three-dimensional (3-D) magnetic source imaging, using the combined techniques of magnetoencephalography and 3-D magnetic resonance imaging, was employed to localize precisely a structural lesion in the precentral gyrus. The lesion was primarily a hematoma located in the right frontal lobe and was associated with a cryptic arteriovenous malformation that had produced repeated seizures with progressive left hemiparesis. 3-D magnetic source imaging mapped the entire somatosensory homunculus and localized the hematoma in the precentral gyrus. Both this relationship and the deduced localization were confirmed by a cortical recording of somatosensory evoked potentials at the time of surgery. 3-D magnetic source imaging proved to be useful in localizing cortical lesions precisely and in determining preoperatively the best form of treatment for the peri-Rolandic lesions.

Publication types

  • Case Reports

MeSH terms

  • Adult
  • Brain Mapping / instrumentation*
  • Cerebral Hemorrhage / pathology
  • Cerebral Hemorrhage / physiopathology*
  • Cerebral Hemorrhage / surgery
  • Computer Graphics*
  • Electric Stimulation
  • Evoked Potentials, Somatosensory / physiology*
  • Humans
  • Image Processing, Computer-Assisted / instrumentation*
  • Magnetic Resonance Imaging / instrumentation*
  • Male
  • Median Nerve / physiopathology
  • Motor Cortex / pathology
  • Motor Cortex / physiopathology*
  • Motor Cortex / surgery
  • Reaction Time / physiology
  • Somatosensory Cortex / pathology
  • Somatosensory Cortex / physiopathology*
  • Somatosensory Cortex / surgery