Clinical Study Of Preoperative Diagnostic Value Of Conventional Magnetic Resonance Imaging Combined With DWI Sequence In The Diagnosis Of Anal Fistula

Objective To explore the significant advantages of MRI routine sequence combined with DWI sequence in the same high anal fistula for color Doppler ultrasound in the anal canal,detection rate of fistulas,internal orifices,abscesses,hidden lesions,and classification of anal fistula to explore the MIDDI.Preoperative clinical diagnostic value of serial combined with conventional serial anatomy for high anal fistula.Methods The pelvic MRI and endonasal ultrasound(EUS)were used for preoperative examination in 60 cases of patients with clinically advanced anal fistula.The actual surgical results prevailed.The results are compared with the EUS test results.Results The subject of this study was to perform MRI and endosonography on the same patient.Therefore,there was no difference in gender,age,or course of disease between the two groups.There was no need for statistical analysis between the groups.Comparison of the fistula display: The MRI and EUS groups had statistically significant differences in the accuracy of preoperative anal fistula(P<0.05).There was a statistically significant difference in the distribution of the anal fistula after surgery(P<0.05).In the diagnosis of fistulas,MRI preoperative examination found 107 fistulas,the positive rate was 95.54%,EUS preoperative examination found 93 fistulas,the positive rate was 83.04%,for the diagnosis of the presence or absence of iliac,MRI examination Of 44 cases,the positive rate was 91.67%.EUS showed 34 cases with a branch,and the positive rate was 70.80%.Therefore,in the diagnosis of the number of anal fistulas and the presence or absence of branches,MRI was superior to EUS.Anal fistula internal orifice comparison: The MRI group and the EUS group had a statistically significant preoperative diagnosis of the internal orifice(P<0.05).The surgically confirmed internal orifice was 70,and the MRI found 66 with an accuracy rate of 94.29%.EUS Of the 58 found,the accuracy rate was 82.86%.Although the intracavity color Doppler ultrasonography has a high diagnostic rate for the internal orifice,compared with MRI,the intracavitary color exceeds the disadvantage,and may be higher than the selected sample for an anal fistula.The position of the internal orifice is higher and the length of the color ultrasound examination probe is affected.Limited relationship.Anal fistula abscess and occult lesions comparison: MRI group and EUS group found no significant difference in the preoperative diagnosis of anal fistula with abscess(P>0.05),but the detection of occult lesions in the anal fistula was statistically significant(P<0.05).Among the 60 patients,47 cases were confirmed by surgery to have an abscess.37 cases of occult lesions were found.47 cases of combined abscesses were found on MRI.33 cases of occult lesions were found.The accuracy rates were 100% and 89.36%,respectively.EUS revealed 42 cases of abscesses.Occult lesions were found in 20 cases.The accuracy rates were 89.19% and 54.05%,respectively.MRI has high resolution of soft tissue,DWI sequence is sensitive to water molecules,and abscesses and hidden lesions are clearly displayed.Comparison of classification of anal fistula: Compared with surgical results,the preoperative classification of anal fistula in the MRI group and the EUS group was statistically significant(P<0.05).EUS has significant diagnostic value for sphincter spasm and sphincter spasm,but the detection rate for sphincter spasm and sphincter spasm is low,and the diagnostic value is not high.The reason may be that ultrasonic waves do not penetrate the external sphincter muscles very well,and thus do not display well in the lesions located above the levator ani muscle or in the rectal fossa of the ischium.Conclusion MRI technology has a clear ability to distinguish soft tissue,and can be three-dimensional multi-plane,multi-angle imaging,less movement artifacts,can clearly identify the location of the inner mouth,clear display of the muscle structure of the anus tissue,can clear the anal fistula supervisor,Branches,fistulas and perianal tissue,accurate classification of anal fistula.The addition of MRIDWI sequence can clearly show abscesses and occult lesions.Therefore,MRI plays an absolute advantage in the preoperative diagnosis of anal fistula and has become the gold standard for the diagnosis of anal fistula at home and abroad.