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Mucinous versus nonmucinous rectal carcinomas: differentiation with MR imaging
S M Hussain1, E K Outwater, E S Siegelman
1Department of Radiology, Thomas Jefferson University Hospital, Philadelphia, Pa., USA.
Radiology
|November 30, 1999
Summary
Magnetic resonance (MR) imaging can differentiate mucinous from nonmucinous rectal tumors. Mucinous tumors exhibit high signal intensity (SI) on T2-weighted images, aiding in diagnosis.
Area of Science:
- Radiology
- Oncology
- Gastroenterology
Background:
- Distinguishing mucinous from nonmucinous rectal tumors is crucial for treatment planning.
- Magnetic resonance (MR) imaging offers advanced visualization techniques for rectal pathologies.
Purpose of the Study:
- To evaluate the efficacy of quantitative and qualitative MR imaging measures in differentiating mucinous and nonmucinous rectal tumors.
Main Methods:
- MR imaging, including T1-weighted spin-echo, T2-weighted fast SE, and gadolinium-enhanced T1-weighted sequences, was performed in 26 patients.
- Quantitative analysis involved calculating signal intensity (SI) ratios (tumor-to-muscle, tumor-to-fat, tumor-to-urine).
- Qualitative assessment included evaluating SI and contrast-enhancement patterns by blinded readers.
Main Results:
- Mucinous tumors demonstrated significantly higher SI on T2-weighted fast SE images compared to nonmucinous tumors.
- Quantitative SI ratios were significantly higher in mucinous tumors (P < .00002).
- Qualitative assessment showed high inter-reader agreement for SI and contrast-enhancement patterns.
Conclusions:
- MR imaging, particularly T2-weighted fast SE sequences, effectively differentiates mucinous from nonmucinous rectal tumors.
- High SI on T2-weighted images is a key indicator of mucinous rectal tumors.