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《Chinese Journal of Medical Imaging Technology》 2011-01
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High-resolution MRI for anal fistula classification

GUO You1,CHEN Zhao2,LIU Bi-hua2,LI Jian-ming2(1.Department of Interventional Treatment,2.Department of Radiology,Dongguan People's Hospital,Dongguan 523018,China)  
Objective To observe the clinical value of high-resolution MRI for anal fistula classification.Methods Thirteen patients with surgically proved anal fistulas underwent preoperative high-resolution MR imaging.The imaging protocol included fast field echo(FFE) T1WI at axial planes,turbo spin echo(TSE) T2WI at axial and coronal planes,spectral presaturation inversion recover(SPIR) T2WI at axial planes and contrast-enhancement T1 high resolution isotropic volume excitation(THRIVE).All anal fistulas were classed based-on MRI and compared with operation,including the appearances of internal fistula,extra fistula,fistula canales and perianal abscess.Results In 13 patients,1 anal fistula was grade Ⅰ,1 was grade Ⅱ,1 was grade Ⅲ,5 were grade Ⅳ and 5 were grade Ⅴ.There were 18 fistula canales,13 internal fistulas,11 extra fistulas and 11 perianal abscess in operation.MR displayed 16 fistula canales,13 internal fistulas,11 extra fistulas and 11 perianal abscess.The diagnostic accuracy of MRI for fistula was 88.89%(16/18),the positive rate for internal fistula was 92.86%(13/14).The site,number and perianal abscess of external fistula showed with MRI was the same with operation.Conclusion High-resolution MRI is a very accurate preoperative technique for evaluating the classification of anal fistula.Preoperative MRI can dictate the surgical procedure of choice and is an important determinant of outcome.
【CateGory Index】: R657.1;R445.2
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