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Rectal carcinoma: double-contrast MR imaging for preoperative staging
N O Wallengren1, S Holtås, A Andrén-Sandberg
1Department of Radiology, Center for Medical Imaging and Physiology, University Hospital, S-221 85 Lund, Sweden.
Radiology
|February 7, 2001
Summary
Double contrast-enhanced MRI accurately stages rectal cancer, improving visualization of the rectal wall and surrounding tissues. This method is superior to nonenhanced MRI for precise tumor staging.
Area of Science:
- Radiology
- Oncology
- Medical Imaging
Background:
- Rectal carcinoma staging is crucial for treatment planning.
- Conventional MRI may have limitations in visualizing rectal wall layers and perirectal tissues.
Purpose of the Study:
- To compare conventional MRI, MRI with ferristene enema, and MRI with double contrast (ferristene enema + gadodiamide injection) for rectal carcinoma staging.
- To evaluate the effectiveness of enhanced MRI techniques in differentiating rectal wall layers and perirectal spaces.
Main Methods:
- Twenty-nine patients with rectal carcinoma underwent three types of MRI: conventional, ferristene enema, and double contrast.
- Rectal wall analysis and tumor staging were performed and correlated with histopathology.
Main Results:
- Gadodiamide injection enhanced rectal mucosa, allowing visualization of mucosa, tunica muscularis, and perirectal space.
- Double-contrast MRI demonstrated superior performance compared to ferristene-based contrast alone.
- Double-contrast MRI achieved 100% sensitivity, 70% specificity, and 90% accuracy for stages beyond Dukes A.
Conclusions:
- Double contrast-enhanced MRI significantly improves the accuracy of rectal carcinoma staging.
- Enhanced MRI provides detailed visualization not achievable with nonenhanced imaging.