Comment je fais une IRM anopérinéale ?

Anal fistulas can be primitive or secondary and among these, the most frequent etiology is the Crohn's disease. The treatment is often a combination of medical and surgical therapies. Clinical examination is limited. Fistulas can be associated with abscesses. In pretherapeutics, it is necessary to know the extension of fistula in depth and its extension within the sphincters, the existence of secondary or complex tracts, the presence of abscess and the activity of fistula tracts. MRI is the reference method today, allowing a precise assessment. It is realized with a coil surface to obtain 3 plans T2 and T1-weighted sequences. MRI could also be performed under treatment to assess the efficiency of biotherapy particularly in Crohn's disease patients and its utility in the monitoring of long-term healing is under evaluation.