Abstract
Background
Many Crohn's disease patients require surgery. Intraoperative detection of new lesions may lead to change in planned surgery. This study aimed to determine whether magnetic resonance enterography can optimize surgical planning and guide decision making in Crohn's disease.
Methods
Seventy-five patients with complicated Crohn's disease were enrolled and underwent preoperative magnetic resonance enterography. Analysis included imaging accuracy and change in surgical strategy due to discordance with imaging findings.
Results
Surgery was performed laparoscopically in 39/75 patients (52 %), with conversion to open surgery required in six (15 %). Concordance between observers was excellent (kappa value >0.8). Magnetic resonance enterography accuracy for stenosis, abscess, and fistula were all above 85 % in per-patient analysis. In 68/75 cases (90.7 %) surgery was correctly predicted. Conversely, in 7/75 cases (three false-positives and four false-negatives) surgical strategy (type of resection or strictureplasty, n = 5) and/or surgical approach (conversion from laparoscopy to open surgery, n = 2) changed due to discordance with magnetic resonance enterography findings.
Conclusion
Surgical strategy and approach are correctly predicted by magnetic resonance enterography in the majority of patients with complicated Crohn's disease.
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Acknowledgments
The authors would like to acknowledge Marie Cheeseman. This work was supported by Alcesti Scarpellini and FIRMAD (Fondazione Italiana per la Ricerca sulle Malattie dell’Apparato Digerente).
Conflict of Interest
The authors were involved in all the different phases of the study (including enrolment of patients), data analysis and writing of the manuscript. The authors did not receive honoraria for the preparation of this manuscript.
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Dr. Guilherme M. R. Campos (Madison, WI): The paper is an important contribution as it evaluated one of the larger cohorts of patients with Crohn's, as to study accuracy of MR enterography and used a robust reference standard: surgical findings. One of the limitations of the study though, is related to the very use of surgical findings as the reference standard; as any study employing surgery as reference, will suffer from verification bias, as only highly abnormal tests resulting in reference application will be evaluated. Second is the need to better delineate the tests and algorithm used to choose open versus laparoscopic approach and also the criteria for conversion. In addition, the decision for conversion involves too many variables, and what maybe always an open procedure or a conversion in some hands, maybe a standard laparoscopic procedure in others. Lastly, the differentiation of active versus fibrotic Crohn's by MR, and validating MR findings with histological evaluation is not presented in the current analyses.
My questions are: Because MR had a few false positives, should a diagnostic lap be considered in selected patients to confirm the MR findings? And second, should MR completely replace CT enterography or are there clinical scenarios in which CT would be preferred? Thank you.
Closing Discussant
Dr. Antonino Spinelli: Thank you Dr. Campos for your comments and for your questions.
(1) Regarding the first point of the bias intrinsic in using surgery as a reference, that would be the case if our aim would have been to generally assess activity, and not complications as we actually wanted to do.
(2) I agree with you that the choice of the approach (lap or open) is very “operator dependent,” but in the present study, our aim was not to say what should be approached laparoscopically and what not, but to analyze whether MRE can help the single surgeon to correctly choose his approach for that single patient, given his own indication to lap or open surgery.
(3) Active inflammatory vs fibrotic disease remains a challenge for GE and surgeons dealing with CD and we actually have an ongoing study in which we assess inflammation and fibrosis on surgical specimen correlating them with exactly the same bowel segment at MRE.
Two brief answers at your last two questions:
(1) I do not think that a diagnostic lap (or a lap look) should be performed as a standard, because our aim is to correctly and directly address patients to the most appropriate surgical approach, but I agree that in selected cases, it can be done (e.g., in patients with doubtful MRE finding of e–e fistula).
(2) Regarding CT enterography and MRE, we published a couple of years ago prospective comparison, showing that they were able to obtain similar results and that therefore, due to the radiation exposition hazards, MRE should be preferred.
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Spinelli, A., Fiorino, G., Bazzi, P. et al. Preoperative Magnetic Resonance Enterography in Predicting Findings and Optimizing Surgical Approach in Crohn's Disease. J Gastrointest Surg 18, 83–91 (2014). https://doi.org/10.1007/s11605-013-2404-1
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DOI: https://doi.org/10.1007/s11605-013-2404-1