Description

Tian et al reported a grading system for skull base chordoma based on findings on MRI. The authors are from Capital Medical University in Beijing and affiliated research institutes.


Patient selection: skull base chordoma

 

Parameters:

(1) SI T1 FLAIR of tumor

(2) SI T2 of tumor

(3) SI enhanced T1 FLAIR of tumor

(4) SI T1 FLAIR of pons

(5) SI T2 of pons

(6) SI enhanced T1 FLAIR of pons

 

ratio for T1 FLAIR =

= (ST T1 FLAIR of tumor) / (SI T1 FLAIR of pons)

 

ratio for T2 =

= (SI T2 of tumor) / ((SI T2 of pons)

 

ratio for enhanced T1 FLAIR =

= (SI enhanced T1 FLAIR of tumor) / (SI enhanced T1 FLAIR of pons)

 

Ratio for T2

Ratio for Enhanced FLAIR

MR Grade

> 2.49

<= 0.77

I

> 2.49

> 0.77

II

<= 2.49

<= 0.77

II

<= 2.49

> 0.77

III

 

A Grade III tumor:

(1) has a greater blood supply

(2) higher blood loss at surgery

(3) higher risk of tumor progression


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