MR DTI in assessment on invasion of supratentorial gliomas to pyramidal tract

Objective To observe the value of MR DTI in assessing the invasion of supratentorial gliomas to pyramidal tract.Methods Twenty-three patients of brain supratentorial glioma proved with pathology underwent MR DTI.Giomas were divided into low(n=7) and high grade groups(n=16) according to tumor malignancy,and were divided into symptomatic group(n=11) and non-symptomatic group(n=12) according to the limb symptoms.ADC and FA of pyramidal tract were recorded,and the pyramidal tracts were reconstructed and analyzed statistically.Results FA values of pyramidal tracts of tumor side in the internal capsule area were significantly lower than those in contralateral part in high grade gliomas(P0.05).There was no difference of ADC among all three locations in both low and high grade gliomas.ADC of the pyramidal tract in internal capsule in the tumor side in the symptomatic group was higher than that in contralateral part(P0.01).FA values of pyramidal tracts of tumor side in the internal capsule area and cerebral peduncle area were lower than those in contralateral part in the symptomatic group(P0.05),but there was no difference of pyramidal tract in the pone slices(P0.05).Infiltration and destroy of the pyramidal tracts could be seen in the tumor side in symptomatic group in the reconstruction images.Conclusion MR DTI can display the infiltration of pyramidal tracts caused by supratentorial gliomas in details.