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| Imaging findings and a comparative study of gastric schwannomas and gastric stromal tumors on multi-slice CT |
| XU Hui-xin, XU Qing |
| Department of Radiology, the First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China |
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Abstract Objective: To investigate CT findings of gastrointestinal schwannomas(GS) and gastric stromal tumors(GST), and further to compare their CT features in order to differentiate GS from GST. Materials and Methods: 19 GSs and 76 GSTs proven surgically and pathologically were enrolled in this study. Two experienced radiologists retrospectively evaluated and compared the CT features including size, contour, growth pattern, pattern and degree of contrast enhancement, and the presence of intralesional low attenuation area, hemorrhage and calcification. The statistical significance was evaluated by using 95％ confidence interval, one-way ANOVA, LSD test and Chi-Square test． Results: As the diameter was concerned, GSs were significantly bigger than GSTs at very low risk(P=0.04), and smaller than GSTs at high risk(P=0.01). The contour was round or oval in most GSs(18/19), GSTs at very low risk(16/16), GSTs at low risk(28/34) and GSTs at intermediate risk(11/13), but lobulated in GSTs at high risk(8/13). GSTs at very low risk frequently demonstrated an endoluminal growth pattern(12/16), while a homogeneous enhancement pattern was frequently found in GSs(18/19) and GSTs at very low risk(15/16). Good enhancement degree was more common in GSTs at low risk(26/34), GSTs at intermediate risk(11/13) and GSTs at high risk(13/13) than in GSs（9/19）. The intralesional low attenuation area was more common in GSTs at low risk(11/34), GSTs at intermediate risk(6/13) and GSTs at high risk(11/13) than in GSs(1/18). Conclusion: GSs frequently show a round or oval appearance with slight homogeneous enhancement pattern and rare intralesional necrosis, hemorrhage or calcification. These CT findings are common in GSTs at very low risk, low risk and intermediate risk, but distinguishable from GSTs at high risk.
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Received: 21 July 2014
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2015, Vol. 26 
