Objective: To summarize MRI features and investigate the relationship between MRI manifestations and risk stratification in rectal stromal tumor. Methods: Appearances of MRI in 18 cases of rectal gastrointestinal stromal tumors diagnosed by surgery and pathology between 2012 and 2016 were analyzed retrospectively, assessing tumor risk stratification. Results: Pathological classification was as following: among them, 72%(13/18) were high-risk, 22%(4/18) were intermediated-risk, 6%(1/18) were low-risk. MRI findings were graded for rectal stromal tumors by two radiologists. There was a significant correlation between certain MRI features(tumor size, boundary and uniformity of signal) and tumor risk stratification(P<0.05). However, tumor growth pattern and morphous were found to have no statistical significance for high-risk malignant rectal stromal tumor. Conclusion: Rectal stromal tumor has some specific MRI findings which could have important significances for qualitative diagnosis, assessing tumor risk stratification and differential diagnosis.
Key words
Rectal neoplasms /
Magnetic resonance imaging
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