Representational cortical plasticity associated with brain tumours: evidence from laser-induced interstitial thermotherapy.
OBJECTIVE
To test the hypothesis that cortical plasticity related to destructive tumour growth is functionally relevant. This hypothesis predicts that function is dependent on the intactness of tissue surrounding the tumour.


METHODS
Eight patients underwent laser-induced interstitial thermotherapy (LITT) for minimally invasive palliative treatment of brain tumours located in eloquent frontal motor regions including the primary motor cortex. A multimodal approach was used to assess the functional outcome of patients after LITT in detail.


RESULTS
Following LITT, motor function deteriorated in four patients. In three of these four patients the LITT-induced lesion involved minimal parts of adjacent non-tumorous tissue. By contrast, the other four patients whose LITT-induced signal changes were confined to the tumour, showed no functional deficits.


CONCLUSIONS
These findings support the idea that peri-tumorous neuronal circuitry in motor competent areas may permanently take over those functions that were formerly represented in the neuronal tissue destroyed by the tumour.
Kunesch
E
E
Department of Neurology, University of Rostock, Germany. erwin.kunesch@med.uni-rostock.de
Classen
J
J
Bettag
M
M
Kahn
T
T
Ulrich
F
F
Bock
W J
WJ
Freund
H J
HJ
Seitz
R J
RJ
D000328:Adult; D001932:Brain Neoplasms / Q000473:pathology* / Q000503:physiopathology; D005260:Female; D005625:Frontal Lobe / Q000503:physiopathology*; D006801:Humans; D006979:Hyperthermia, Induced / Q000379:methods; D007834:Lasers; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009044:Motor Cortex / Q000503:physiopathology*; D009069:Movement Disorders / Q000209:etiology; D009473:Neuronal Plasticity; D010166:Palliative Care; D014055:Tomography, Emission-Computed