近年来由于灰阶超声检查和CT扫描等非介入性显影方法的进展,对消化道肿瘤的术前分期又重新引起重视。超声检查受肠腔气体及附近骨骼重叠的影响,因此CT在有些医疗机构成为确定胃肠道肿瘤分期的主要检查方法。本文讨论利用CT扫描及其它显影方法对消化道肿瘤局部扩散和远处转移以及各种并发症的诊断应用。术前分期多年来,临床医师认为放射疗法对消化道肿瘤是不敏感的, In recent years due to grayscale ultrasound and CT scanning and other non-invasive development of the progress of the preoperative staging of gastrointestinal tumors have re-attention. Ultrasound is affected by intestinal gas and adjacent bone overlap, so CT in some medical institutions to determine the main gastrointestinal cancer staging of the main inspection methods. This article discusses the use of CT scan and other imaging methods for the local spread and distant metastasis of gastrointestinal tumors and the diagnostic applications of various complications. Preoperative staging For many years, clinicians think radiotherapy is not sensitive to gastrointestinal tumors,