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16－slice Spiral CT in the Diagnosis of Gastrointestinal Stromal Tumors Value

寻航  黄仲奎  龙莉玲  桑笑乐  管学春  黎靖宇

广西医科大学第一附属医院放射科，南宁 530021

Hang Xun，Zhong－kui Huang，Li－ling Long，Xiao－le Sang， Xue－chun Guan，Jing－yu Li

Department of Radiology，the Affiliated Hospital of Guangxi Medical University，Guangxi 530021，China

Abstract

　　Objective：To analysis the CT features of gastrointestinal stromal tumors （GISTs） and to evaluate multislice spiral CT （MSCT） in the diagnosis of the disease．

　　Methods： Twenty－one patients with gastrointestinal stromal tumor underwent spiral CT. Images were assessed retrospectively for tumor location，size，morphology，enhancement features，relationships to the surrounding organs，and metastasis.

　　Results：The tumors originated from the stomach（n＝10），jejunum and ileum（n＝6），mesentery（n＝2），colon and rectum （n＝3）.Three patients as benign， seven as borderline，and eleven as malignant. The diagnosis of hepatic carcinoma made respectively by transverse images in two patients were changed correctly by multiplanar reconstruction （MPR） images. They most commonly had an exophytic growth pattern（n＝16），and intraluminal masses（n＝5）.Most tumors showed heterogeneons in density except three patients with benign tumors．There were central low attenuating areas in the masses as well as peripheral enhancement in four patients with high－grade malignancy. Correlation of this appearance with pathologic findings demonstrated that peripheral areas represented solid portions composed of spindle and（or） epithelioid cells，central areas of low attenuation corresponded to degeneration，hemorrhage，cyst formation，or necrosis. Punctate calcification was noted in one patient. The invasion of pancreas and spleen were seen respectively in two，one patients. The metastasis of hepatic and pneumonic were identified respectively in two，one. CTA shows for the in vivo tumor angiogenesis and vascular conditions，Benign tumor vascular smooth， straight， hair－like pieces were malignant vascular lesions， distorted and incomplete.