ObjectiveTo investigate the dynamic enhanced LAVA scanning and postprocessing technique in the diagnosis of anal fistula. MethodsThirty five patients with anal fistula were chosen, and diagnosed by B-ultrasound, MRI scan, and dynamic enhanced LAVA scanning, respectively; The inside mouth of anal fistula、location of abscess and Parks types were analyzed,and the coincidence rate were compared between different techniques. ResultsTransrectal ultrasonography for position of the inside mouth of anal fistula has the highest rate of 92.11%, followed by LAVA dynamic contrast-enhancement with the rate of 50.00%, and MRI routine scan with the rate of 21.05%; the difference was statistically significant (P＜0.05). LAVA dynamic contrast-enhancement for the fistula path and number has the highest detection rate of 97.67%, higher than 76.74% of transrectal ultrasonography and 72.09% of MRI routine scan; the difference was statistically significant (P＜0.05). LAVA dynamic contrast-enhancement and MRI routine scan for location and number of abscess had the detection rate of 100%, higher than 61.54% transrectal ultrasonography; the difference was statistically significant (P＜0.05). ConclusionLAVA dynamic contrast-enhancement can improve the diagnosis of path and number for fistula, and increase the coincidence rate of postoperative for fistula type, but has a disadvantage in the detection of the inside mouth of anal fistula position and number, compared with transrectal ultrasonography. The diagnosis of anal fistula should combine with LAVA dynamic contrast-enhancement and transrectal B-ultrasound together, to meet the design of operation, decrease the postoperative complications and reduce the relapse rate.

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