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Preoperative mapping of cortical language areas in adult brain tumour patients using PET and individual non-normalised SPM analyses

  • Philipp T. MeyerEmail author
  • Laszlo Sturz
  • Mathias Schreckenberger
  • Uwe Spetzger
  • Georg F. Meyer
  • Keyvan S. Setani
  • Osama Sabri
  • Udalrich Buell
Original Article

Abstract

In patients scheduled for the resection of perisylvian brain tumours, knowledge of the cortical topography of language functions is crucial in order to avoid neurological deficits. We investigated the applicability of statistical parametric mapping (SPM) without stereotactic normalisation for individual preoperative language function brain mapping using positron emission tomography (PET). Seven right-handed adult patients with left-sided brain tumours (six frontal and one temporal) underwent 12 oxygen-15 labelled water PET scans during overt verb generation and rest. Individual activation maps were calculated for P<0.005 and P<0.001 without anatomical normalisation and overlaid onto the individuals' magnetic resonance images for preoperative planning. Activations corresponding to Broca's and Wernicke's areas were found in five and six cases, respectively, for P<0.005 and in three and six cases, respectively, for P<0.001. One patient with a glioma located in the classical Broca's area without aphasic symptoms presented an activation of the adjacent inferior frontal cortex and of a right-sided area homologous to Broca's area. Four additional patients with left frontal tumours also presented activations of the right-sided Broca's homologue; two of these showed aphasic symptoms and two only a weak or no activation of Broca's area. Other frequently observed activations included bilaterally the superior temporal gyri, prefrontal cortices, anterior insulae, motor areas and the cerebellum. The middle and inferior temporal gyri were activated predominantly on the left. An SPM group analysis (P<0.05, corrected) in patients with left frontal tumours confirmed the activation pattern shown by the individual analyses. We conclude that SPM analyses without stereotactic normalisation offer a promising alternative for analysing individual preoperative language function brain mapping studies. The observed right frontal activations agree with proposed reorganisation processes, but they may also reflect an unspecific recruitment of the right-sided Broca's homologue in the effort to perform the task.

Keywords

Preoperative brain mapping Positron emission tomography Brain tumour Cortical reorganisation 

Notes

Acknowledgement

The authors would like to thank the team of the Cyclotron/PET facility of the Department of Nuclear Medicine of the Hospital of the University of Technology, Aachen.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • Philipp T. Meyer
    • 1
    • 3
    • 5
    Email author
  • Laszlo Sturz
    • 1
  • Mathias Schreckenberger
    • 1
  • Uwe Spetzger
    • 2
  • Georg F. Meyer
    • 4
  • Keyvan S. Setani
    • 1
  • Osama Sabri
    • 1
    • 3
  • Udalrich Buell
    • 1
  1. 1.Department of Nuclear MedicineAachen University of TechnologyAachenGermany
  2. 2.Department of NeurosurgeryAachen University of TechnologyAachenGermany
  3. 3.Department of Nuclear MedicineUniversity of LeipzigLeipzigGermany
  4. 4.MacKay Institute of Communication and NeuroscienceKeele UniversityUK
  5. 5.Institute of MedicineResearch Centre JülichJülichGermany

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