Comparison of MR enteroclysis with MR enterography and conventional enteroclysis in patients with Crohn's disease

To prospectively compare the diagnostic accuracy of MR enteroclysis with duodenal intubation with MRI after drinking oral contrast agent only (MR enterography) with conventional enteroclysis (conv-E) as reference standard in patients with Crohn's disease. Forty consecutive patients (22 males and 18 females; mean age 36; range 16-74 years) with proven Crohn's disease underwent conv-E and MR imaging. Twenty-two patients underwent MR enteroclysis with intubation (MRE) and 18 underwent MR-enterography (MR per OS). Two radiologists reached a consensus about the following imaging findings: luminal distension and visualization of superficial mucosal, mural and mesenteric abnormalities. Standard descriptive statistics and a Wilcoxon rank sum test were used. Statistical significance was inferred at P<0.05. There was no significant difference in the adequacy of luminal distention between the MRE and conv-E (P=0.08), and both were statistically superior in comparison to MR per OS in the distension of the jejunum (P<0.01) and less significant at the ileum and terminal ileum levels (P<0.05). MRE and conv-E were comparable for the accuracy of superficial mucosal abnormalities; meanwhile conv-E compared with MR per OS was statistically superior (P<0.01). MRE compared with MR per OS was statistically better when visualizing superficial abnormalities (P<0.01). No statistically significant differences were found in assessing the diagnostic efficacy between MR examinations for the depiction of mural stenosis (P=0.105) and fistulae (P=0.67). The number of detected mesenteric findings was significantly higher with both MRE and MR per OS compared to conv-E (P<0.01). MRE can serve as the diagnostic procedure for initially evaluating patients suspected of having Crohn's disease. MR per OS may have a role in patients that refuse or have failed intubation and also for follow-up.