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Clinical Staging: CT and MRI

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Rectal Cancer

Abstract

The unique anatomy of the rectum, as well as its enveloping mesorectum and mesorectal fascia, provides interesting challenges for imaging modalities. Staging investigations should be able to identify the characteristics of tumor that determine prognosis as well as the anatomic delineators of local spread that predict surgical resectability with a clear radial margin. Multidetector CT with multiplanar formatting allows visualization of images in three dimensions. Though it is sometimes accurate in staging upper rectal tumors, it is less informative than MRI, and this is particularly so for lower rectal tumors. The ability of MRI to accurately image the relevant structures of the mesorectum in rectal cancer has become increasingly evident. Advances in imaging techniques, together with development of dedicated methods for performing MR examination in rectal cancer, have resulted in improved image quality. Standardized image interpretation using thin section (3 mm slices) magnetic resonance imaging and a small field of view (160–200 mm) allows accurate assessment of tumor infiltration within and beyond the rectal wall and several other important prognostic features in rectal cancer.

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Brown, G., Dighe, S., Taylor, F. (2010). Clinical Staging: CT and MRI. In: Czito, B., Willett, C. (eds) Rectal Cancer. Current Clinical Oncology. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-60761-567-5_2

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