Objective:

To explore the application value of magnetic resonance imaging (MRI) in the diagnosis of complex anal fistula.

Methods:

A total of 32 cases with complex anal fistula underwent endoanal ultrasound (EAUS) and MRI. The diagnostic accuracies of EAUS and MRI were compared with surgical results. Their sensitivities of displaying the internal openings

primary tracts and secondary extensions or abscesses of complex anal fistula were compared too.

Results:

Compared with the surgical results

the accuracy of MRI was 90.6%. There were significant differences in the sensitivities of displaying internal openings and secondary extensions or abscesses between MRI and EAUS (

P

0.05)

but there was no significant dif

ference in the sensitivity of displaying primary tracts between MRI and EAUS.

Conclusion:

The accuracy of diagnosing complex anal fistula by MRI was 90.6%. Compared with EAUS

MRI could more accurately display the internal openings

primary tracts

secondary extensions or abscesses of complex anal fistula

with important value in clinical application.