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Ⅱ、胃肠道癌瘤的CT诊断一、胃肠道癌的CT表现原发性胃肠道癌瘤多用X线钡剂检查和内窥镜来发现,很少用CT检查。CT扫描的作用是对原发性恶性肿瘤进行分期和制订治疗计划,并对治疗效果进行估计,以及发现复发病变。有时可帮助鉴别诊断。 (一)胃癌是胃恶性肿瘤最常见的一种。术前诊断多依靠X线及内窥镜技术。动脉造影、核医学、超声等都可用以观察肿瘤扩展情况。但每一种检查方法都有一定的限度,而CT对胃癌较以上几种方法观察到的情况更多,并可作分期。进展期胃癌的CT表现是:局限性或弥漫性胃壁增厚,腔内肿块。有的表现胃的出入口边缘不锐利,溃疡性肿块和幽门梗阻,或有等密度的病变与邻近器官集合在一起。胃周围脂肪层消失是肿瘤向胃外扩展的最
II. CT Diagnosis of Gastrointestinal Carcinoma 1. CT Findings of Gastrointestinal Carcinoma Primary gastrointestinal cancers are mostly detected with X-ray tincture and endoscopy, and CT scans are rarely used. The role of CT scans is to stage primary cancers and develop treatment plans, estimate treatment effects, and find recurrent lesions. It can sometimes help with differential diagnosis. (A) Gastric cancer is the most common type of gastric cancer. Preoperative diagnosis depends on X-ray and endoscopic techniques. Arteriography, nuclear medicine, ultrasound, etc. can be used to observe tumor expansion. However, each test method has a certain limit, and CT has more observations of gastric cancer than the above methods, and can be used for staging. CT manifestations of advanced gastric cancer are: limited or diffuse gastric wall thickening, intraluminal mass. Some show that the entrance and exit of the stomach is not sharp, ulcerous and pyloric obstruction, or an equal density of lesions and adjacent organs together. The disappearance of the fat layer around the stomach is the most extensive tumor spread out of the stomach.