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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