A magnetization transfer imaging study in patients with temporal lobe epilepsy and interictal psychosis

Dominique Flügel, Mara Cercignani, Mark R. Symms, Matthias J. Koepp, Jacqueline Foong

Research output: Contribution to journalArticle

Abstract

Background: Findings from previous neuropathological and neuroimaging studies in patients with epilepsy and interictal psychosis have been inconclusive, and both focal and widespread brain abnormalities have been reported. Thus, further investigation with advanced in vivo magnetic resonance imaging (MRI) techniques, such as magnetization transfer imaging, capable of detecting more subtle brain abnormalities, is warranted. Methods: Twenty patients with temporal lobe epilepsy and interictal psychosis were compared with 20 nonpsychotic patients. Patients were matched with respect to conventional MRI findings. Each group comprised of 10 patients with hippocampal sclerosis (6 left, 4 right) and 10 patients without focal lesions on MRI. A voxel-based analysis was used for the group comparisons. Results: Voxel-based analysis revealed significant reductions of magnetization transfer ratio (an index of signal loss derived from magnetization transfer imaging) in the left superior and middle temporal gyri in the psychotic patients for the subgroup of patients with no focal lesions on MRI. There were no significant volumetric differences between the psychotic and nonpsychotic patients. Conclusions: Focal cortical magnetization transfer ratio abnormalities in the left temporal lobe unrelated to volume changes can be demonstrated in some temporal lobe epilepsy patients with interictal psychosis. Our findings might reflect subtle neuropathological abnormalities that are undetected by conventional MRI.

Original languageEnglish
Pages (from-to)560-567
Number of pages8
JournalBiological Psychiatry
Volume59
Issue number6
DOIs
Publication statusPublished - Mar 15 2006

    Fingerprint

Keywords

  • Epilepsy
  • Magnetic resonance imaging
  • Magnetization transfer imaging
  • Psychosis
  • Temporal lobe
  • Voxel-based morphometry

ASJC Scopus subject areas

  • Biological Psychiatry

Cite this