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Table 1 Summary of the five groups classified according to lesion conspicuity detected by CE-T1WI and delayed post-contrast FLAIR

From: Added value of delayed post-contrast FLAIR in diagnosis of metastatic brain lesions

Group Conspicuity of enhancement Lesions Supra- or Infratentorial Involved anatomy Size Number of lesions
1 Only on delayed post-contrast FLAIR 16 Infratentorial Leptomeningeal  > 2.5 cm 1
    Supra-tentorial Leptomeningeal  > 2.5 cm 2
      0.5– < 1.5 cm 1
      1.5 < 2.5 cm 4
     Tiny cortical  < 0.5 cm 7
      0.5–> 1.5 cm 1
2 Only bon CE T1 1 Supra-tentorial Subependymal tiny nodule  < 0.5 cm 1
3 Equally on CE T1 and delayed post-contrast FLAIR 28 Infratentorial White matter 0.5– < 1.5 cm 1
    Supra-tentorial White matter  < 0.5 cm 4
      0.5– < 1.5 cm 3
      1.5– < 2.5 cm 3
       > 2.5 cm 8
     Tiny cortical  < 0.5 cm 2
     Pachymeningeal   
       > 2.5 cm 4
     Leptomeningeal  < 0.5 cm 1
      1.5– < 2.5 cm 2
4 Better on delayed post-contrast FLAIR 43 Infratentorial White matter  < 0.5 cm 3
      0.5– < 1.5 cm 2
      1.5– < 2.5 cm 1
       > 2.5 cm 2
    Supra-tentorial White matter 0.5– < 1.5 cm 11
      1.5– < 2.5 cm 4
       > 2.5 cm 11
     Pachymeningeal   1
     Leptomeningeal   4
     Tiny cortical   4
5 Better on CE T1 11 Infratentorial White matter  < 0.5 cm 1
      0.5– < 1.5 cm 2
       > 2.5 cm 1
    Supra-tentorial White matter 0.5– < 1.5 cm 3
       > 2.5 cm 2
     Pachymeningeal   2