CT diagnostic value in gastrointestinal stromal tumors
LIAO Yu zhen *, ZHANG Zhi qiang, WANG Qiu liang, LI Jing yu(Department of Radiology, Beijing Army General Hospital, Beijing 100700, China)
Objective To investigate the diagnostic value of CT in gastrointestinal stromal tumors (GISTs). Methods Both plain and two phase dynamic enhanced spiral CT features in 18 cases with pathologically proved GISTs were retrospectively analyzed. Results Eighteen GISTs originated from stomach ( n =9) or small bowel ( n =9), in which 6 benign tumors located in stomach, 12 cases of malignant or potential malignant tumors in stomach ( n =3) or in small bowel ( n =9). CT findings of GISTs included well defined tumor margin (16/18, 88.9%), round or oval in shape(11/18, 61.1%) and homogeneous density (10/18, 55.6%). The benign tumors displayed homogeneous enhancement (5/6,83.3%), whereas the malignant were heterogeneous density both on plain (7/12, 58.3%) and enhanced (11/12, 91.7%) CT scans. Accuracy of CT diagnosis for location and pathologic features of GISTs were 89.5% (16/18) and 83.3% (15/18), respectively. Conclusion CT is a valuable examination for GISTs. CT can precisely display the location, shape and size of GISTs, and thus is very helpful to differentiate the benign from the malignant tumors.