Department of Radiology, Mayo Clinic, 4500 San Pablo Road, Jacksonville, FL, 32224, USA.
Abdom Radiol (NY). 2019 Jun;44(6):2089-2103. doi: 10.1007/s00261-019-01955-y.
Although the small intestine accounts for over 90% of the surface area of the alimentary tract, tumors of the small intestine represent less than 5% of all gastrointestinal tract neoplasms. Common small bowel tumors typically are well evaluated with cross-sectional imaging modalities such as CT and MR, but accurate identification and differentiation can be challenging. Differentiating normal bowel from abnormal tumor depends on imaging modality and the particular technique. While endoscopic evaluation is typically more sensitive for the detection of intraluminal tumors that can be reached, CT and MR, as well as select nuclear medicine studies, remain superior for evaluating extraluminal neoplasms. Understanding the imaging characteristics of typical benign and malignant small bowel tumors is critical, because of overlapping features and associated secondary complications.
尽管小肠占消化道表面积的 90%以上，但小肠肿瘤仅占所有胃肠道肿瘤的 5%以下。常见的小肠肿瘤通常可以通过横断面成像方式（如 CT 和 MRI）进行很好的评估，但准确识别和区分可能具有挑战性。区分正常肠段和异常肿瘤取决于成像方式和特定技术。虽然内镜检查通常更敏感，可以检测到可触及的腔内肿瘤，但 CT、MR 以及一些核医学研究对于评估腔外肿瘤仍然更具优势。了解典型良性和恶性小肠肿瘤的影像学特征至关重要，因为这些特征存在重叠，并且可能伴有相关的继发性并发症。
