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Table 2 Illustrates the agreement between MRI and US in detecting the location of the fistula

From: Role of endoanal ultrasound in the assessment of perianal fistula in correlation with MRI fistulography

   MRI: relation to sphincter Total Weighted Kappa
No relation Inter-sphincteric Trans-sphincteric Extra-sphincteric
US: Relation to sphincter No relation 0 0 4 4 8 0.706
   0% 0.0% 9.1% 100.0% 6.7%  
  Inter-sphinctiric 0 72 0 0 72  
   0% 100.0% 0.0% 0.0% 60.0%  
  Trans-sphenctiric 0 0a 40 0 40  
   0% 0.0% 90.9% 0.0% 33.3%  
  Extra-sphinctiric 0 0 0 0 0  
   0% 0.0% 0.0% 0.0% 0.0%  
Total   0 72 44 4 120  
    100.0% 100.0% 100.0% 100.0%