Assessment of Disease Activity in Small Bowel Crohn’s Disease: Comparison between Endoscopy and Magnetic Resonance Enterography Using MRIA and Modified MRIA Score

Objectives. To retrospectively compare the results of the MRIA (magnetic resonance index of activity) with a modified MRIA (mMRIA), which was calculated excluding from MRIA formula the data of relative contrast enhancement (RCE).Materials and Methods. MR-E and corresponding endoscopic records of 100 patients were reviewed. MRIA, mMRIA, and SES endoscopic index were calculated for all the patients. Namely, MRIA was calculated as follows: (1.5 × wall thickening + 0.02 × RCE + 5 × intramural edema + 10 × ulcers), while mMRIA was calculated with the modified formula (1.5 × wall thickening + 5 × intramural edema + 10 × ulcers).Results. Mean MRIA and mMRIA values were 19.3 and 17.68, respectivelyp<0.0001. A significant correlationp<0.0001was observed between MRIA and mMRIA scores and between both MR indexes and SESp<0.0001.Conclusions. mMRIA was comparable to MRIA in the evaluation of disease activity in Crohn’s disease.