Prospective comparison of endorectal ultrasound, three-dimensional endorectal ultrasound, and endorectal MRI in the preoperative evaluation of rectal tumorsrid="" |
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Authors: | M Hünerbein W Pegios B Rau T J Vogl R Felix P M Schlag |
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Institution: | Department of Surgery and Surgical Oncology, Robert R?ssle Hospital, Humboldt University, 13122 Berlin, Germany, DE Department of Radiology, Charité University Hospital, 13353 Berlin, Germany, DE
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Abstract: | Background: The aim of this study was to compare the value of endorectal ultrasound (EUS), three-dimensional (3D) EUS, and endorectal
MRI in the preoperative staging of rectal neoplasms.
Methods: Thirty consecutive patients with rectal tumors were assessed by EUS and endorectal MRI. Additionally, three-dimensional ultrasound
was performed in a subgroup of 25 patients. EUS data were obtained with a bifocal multiplane transducer (10 MHz) and processed
on a 3D ultrasound workstation. MR imaging was carried out with a 1.5 T superconducting unit using an endorectal surface coil.
Results: EUS was carried out successfully in all 30 patients, whereas endorectal MRI was not feasible in two patients. Compared with
the histopathological classification, EUS and endorectal MRI correctly determined the tumor infiltration depth in 25 of 30
and 28 patients, respectively. The comparative accuracy of EUS, 3D EUS, and endorectal MRI in predicting tumor invasion was
84%, 88%, and 91%, respectively. EUS, three-dimensional EUS, and endorectal MRI enabled us to assess the lymph node status
correctly in 25, 25, and 24 patients, respectively. Both three-dimensional EUS and endorectal MRI combined high-resolution
imaging and multiplanar display options. Assessment of additional scan planes facilitated the interpretation of the findings
and improved the understanding of the three-dimensional anatomy.
Conclusion: The accuracy of three-dimensional EUS and endorectal MRI in the assessment of the infiltration depth of rectal cancer is
comparable to conventional EUS. One advantage of both methods is the ability to obtain multiplanar images, which may be helpful
for the planning of surgery in the future.
Received: 4 April 2000/Accepted: 25 August 2000/Online publication: 27 October 2000 |
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Keywords: | : Endorectal ultrasound — Three-dimensional endorectal ultrasound — Rectal cancer — Staging — Endorectal MR imaging — Surface coil — Cancer |
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