AB214. The accuracy of magnetic resonance imaging in local staging of rectal cancer post neoadjuvant chemoradiotherapy
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AB214. The accuracy of magnetic resonance imaging in local staging of rectal cancer post neoadjuvant chemoradiotherapy

Stephen Murphy1, John Calvin Coffey1, David Waldron1, Colin Peirce1, Eoghan Condon1, Elizabeth Mulcahy2, Timothy Scanlon2, Martin Shelly2, Bryan Kenny2

1Department of Radiology, 2Department of Pathology, University Hospital Limerick, Dooradoyle, Limerick, Ireland


Background: Patients who are diagnosed with rectal cancer routinely undergo neoadjuvant chemoradiotherapy in our institution. A cohort of these patients undergo restaging magnetic resonance imaging (MRI) pelvis after neoadjuvant treatment, in addition to a pre-treatment MRI. This study aimed to compare local MRI staging with post-operative resection histology report in order to determine the accuracy of pre-operative MRI.

Methods: Analysis of a prospectively updated 3-year database of patients with rectal cancer from 2015 to 2018 was performed. Patients who underwent neoadjuvant chemoradiotherapy and then had restaging MRI rectum were selected. Pre-operative MRI local staging was compared to histology report of total mesorectal excision.

Results: Forty patients were included over the 3-year period. There was a close correlation between MRI and histology in terms of T stage, N stage, mesorectal invasion and vascular invasion.

Conclusions: MRI is a valuable diagnostic modality in the local staging and treatment planning of rectal cancer and demonstrates good correlation with post-operative histology.

Keywords: Magnetic resonance imaging (MRI); staging; rectal cancer


doi: 10.21037/map.2020.AB214
Cite this abstract as: Murphy S, Coffey JC, Waldron D, Peirce C, Condon E, Mulcahy E, Scanlon T, Shelly M, Kenny B. The accuracy of magnetic resonance imaging in local staging of rectal cancer post neoadjuvant chemoradiotherapy. Mesentery Peritoneum 2020;4:AB214.