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Table 1: Conventional MR imaging features and grades of PCNSLs and TDLs
PCNSLs (n = 44) TDLs (n = 21)
No. of lesions ^aP = .463
    Single lesion 24 (54.5%) 8 (38.1%)
    Multiple focal lesions 14 (31.8%) 9 (42.9%)
    Diffuse lesions 6 (13.6%) 4 (19.0%)
Enhancing pattern ^aP = .000
    Homogeneous 24 (54.5%) 2 (9.5%)
    Ring 4 (9.1%) 1 (4.8%)
    Open ring 0 (0.0%) 5 (23.8%)
    Patchy infiltrative 11 (25.0%) 4 (19.0%)
    Streaky infiltrative 3 (6.8%) 0 (0.0%)
    No enhancement 2 (4.5%) 9 (42.9%)
Conventional MR grades ^aP = .000
    Grade 1 0 (0.0%) 5 (23.8%)
    Grade 2 5 (11.4%) 5 (23.8%)
    Grade 3 7 (15.9%) 6 (28.6%)
    Grade 4 8 (18.2%) 4 (19.0%)
    Grade 5 24 (54.5%) 1 (4.8%)
Note:—Grade 1: quite certainly TDL; grade 2: probably TDL; grade 3: equivocal; grade 4: probably PCNSL; grade 5: quite certainly PCNSL.
↵a P values represent the comparison results of PCNSLs and TDLs by use of Pearson χ² test or Fisher exact test.