ABSTRACT
Objective To study the high-field MRI findings of gastrointestinal stromal tumors(GIST), investigate the diagnostic value of the tumor.Methods The image findings and clinical date of 45 cases with GIST proved by pathology were analyzed retrospectively.Results In 45 cases of GIST,tumors were located in the sacroanterior 2 cases, in the perineum 5 cases, in the small bowel 5 cases, in the rectum 10 cases and in the stomach 23 cases.Of 45 cases, there were 11 cases of recurrence,and 34 cases of new-onset.High-field MRI showed the tumors with inhomogeneous signal intensity, the small lesions with even homogeneous signals, the larger with non-uniform signalwhich may be cystic degeneration, necrosis, hemorrhage.After enhanced scan,the solid part of the tumor were abnormal enhancement,necrosis andcystic degeneration no enhancement.Clear or not clear of tumor boundaries andadjacent tissue pressure were prone to metastasis or intraperitoneal planting.Pathology results showed: the tumors cut surface was gray, gray-red, visible envelope.The microscopic morphology was varied, ranging from the number of spindle cells.Immunohistochemical findings were as following: CD34(+) in 43 cases;CD117(+) in 40 cases;Desmin(+) in 18 cases;Vimentin(+) in 15 cases.Conclusion High-field MRI can accurately position gastrointestinal stromal tumor, and has great value for its diagnosis and differential diagnosis.