Gastrointestinal stromal tumor: computed tomographic features
Chamadol, N.; Laopaiboon, V.; Promsorn, J.; Bhudhisawasd, V.; Pagkhem, A.; Pairojkul, C.
Journal of the Medical Association of Thailand 92(9): 1213-1219
2009
ISSN/ISBN: 0125-2208 PMID: 19772182 Document Number: 12750
To describe anatomical distribution and CT findings of gastrointestinal stromal tumors in Srinagarind Hospital. The abdominal CT images of 16 patients (12 men, 4 women: mean age 49 +/- 17SD) with pathologically proven GISTs during 1998-2005 were retrospectively reviewed. The tumor sites, sizes, borders, growth patterns, patterns of enhancement, and sign of malignancy were evaluated. The findings of benign and malignant GISTs were compared. Among sixteen patients, the most common location of GISTs was stomach (56.25%). The others were small bowel (43.75%), and tumor size larger than 5 cm. The present study found that the smooth and mixed smooth and irregular surface lesions are equal in number (50%). The growth was extraluminal in 56.25%. Almost all tumors had inhomogeneous density (n = 15). Intratumoral gas (43.75%), fluid (37.5%), and calcification (50.00%), were present in the tumors. All cases showed inhomogeneous contrast enhancement. The CT signs of malignancy found were invasion of the adjacent organ(s) (62.5%), lymphadenopathy (25%), liver metastasis/nodule (18.75%), ascites (6.25%), perilesional fat plane stranding (93.75%), and pleural effusion (6.25%). The most common site of GISTs is the stomach. The typical tumors appear as inhomogeneous enhancing inhomogeneous extraluminal mass with either well-defined or irregular border. The CT findings cannot be used as a single tool for differentiating the benign from malignant GISTs.
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