Purpose: To evaluate the diagnostic accuracy of MRI, comparing STIR imagesversus T1w post-contrast fat-sat images in patients affected by perianal Crohn’sdisease (CD).Material and methods: From January 2007 to July 2008, 73 patients withperianal CD underwent pelvic MRI using an external phased array coil. All studieswere performed with a 1.5T MRI scanner. STIR and T1w post-contrast fat-satimages were independently analysed by two expert radiologists. Perianal fistulaswere classified according to the Parks surgical classification. All patientsunderwent examination under anesthesia (EUA) that was considered goldstandard.Results: By analysing STIR, images documented 31 simple fistulas, 58 complexfistulas, 12 perianal abscess, 4 rectovaginal fistulas and 1 enteroenterica fistula.By analysing T1w, post-contrast fat-sat images documented 33 simple fistulas,59 complex fistulas, 12 perianal abscess, 4 rectovaginal fistulas and 1enteroenteric fistula. Pelvic MRI clearly depicted perianal manifestations of CD inall patients with full concordance with EUA in 70 patients (96%).Conclusion: MRI can be considered an accurate technique to identify andclassify perianal manifestations of CD. STIR images were almost as useful asT1w post-contrast fat-sat images to show perianal CD findings and could beused to follow-up these patients without administration of contrast-medium.
|Number of pages||1|
|Publication status||Published - 2009|