BACKGROUND AND PURPOSE: Diffusion-weighted images (DWIs) have been used to study various diseases, particularly since echo-planar techniques shorten examination time. Our hypothesis was that DWIs and @entity5 apparent diffusion coefficients (ADCs) could provide additional useful information in the diagnosis of @entity1 with @entity1313 . METHODS: Using a 1.5-T MR unit, we examined 56 @entity1 with histologically verified or clinically diagnosed @entity1313 (17 @entity11 , 21 @entity3 , and 18 @entity1653 ). We determined ADC values and signal intensities on DWIs both in the solid portion of the @entity5 and in the peritumoral, hyperintense areas on T2-weighted images. We also evaluated the correlation between ADC values and @entity5 cellularity in both @entity11 and @entity1653 . RESULTS: The ADCs of low-grade (grade II) @entity816 were significantly higher (P =.0004) than those of other @entity5 . Among @entity5 , ADCs were higher in grade II @entity816 (1.14 +/- 0.18) than in @entity463 (0.82 +/- 0.13). ADCs and DWIs were not useful in determining the presence of peritumoral neoplastic cell infiltration. The ADC values correlated with @entity5 cellularity for both @entity5 (r = -.77) and @entity1653 (r = -.67). CONCLUSION: The ADC may predict the degree of @entity5 , although there is some overlap between ADCs of grade II @entity816 and @entity463 .

The role of diffusion-weighted imaging in @entity1 with XXXX .

@entity1 :: ('9606', 'Species') :: ['patients'] @entity1313 :: ('MESH:D001932', 'Disease') :: ['brain tumors'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor', 'malignancy of astrocytic tumors', 'tumors', 'astrocytic tumors'] @entity11 :: ('MESH:D005910', 'Disease') :: ['gliomas'] @entity1653 :: ('MESH:D008579', 'Disease') :: ['meningiomas'] @entity816 :: ('MESH:D001254', 'Disease') :: ['astrocytomas'] @entity3 :: ('MESH:D009362', 'Disease') :: ['metastatic tumors'] @entity463 :: ('MESH:D005909', 'Disease') :: ['glioblastomas']
@entity1313 :: (MESH:D001932,Disease) :: ['brain tumors']
