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目的与方法：通过阐述２１例转移性小肠肿瘤的超声图像表现，从而达到在常规腹部超声检查中，提高转移性小肠肿瘤的检出率。结果：按照小肠肿瘤的超声图像分型，本组２１例中，１９例均属壁厚型。包括邻近脏器肿瘤对小肠的直接浸润和远隔肿瘤转移或种植，仅２例属腔外肿块型。１例为睾丸精原细胞瘤，小肠转移并有膀胱侵犯至小肠膀胱瘘形成，另１例为卵巢癌腹膜连同小肠种植转移。恶性淋巴瘤、白血病的小肠侵犯，远端小肠和回盲部是其好发部位。沿肠壁长轴侵犯，肠壁增厚以均匀透声性好的低回声区为主要特点。伴有不全肠梗阻和消化道出血。结论：转移性小肠肿瘤与原发肿瘤的部位及组织学类型的关系，目前尚无其它规律可言
Objective and Method: To illustrate the detection of metastatic colorectal neoplasms in 21 cases of metastatic small bowel tumors. Results: According to the ultrasound image classification of small intestine tumors, 19 cases in this group were all of wall thickness type. Including adjacent organ tumors direct infiltration of the small intestine and distant tumor metastasis or implantation, only 2 cases of extraluminal mass. One case was testicular seminoma, small intestine metastasis with bladder invasion to the formation of small intestine bladder spasm, and the other case was ovarian cancer peritoneum with small intestinal metastasis. Malignant lymphoma, leukemia intestinal invasion, distal small intestine and ileocecal is its predilection site. Invading along the long axis of the intestinal wall, the thickening of the intestine wall is characterized by a low echo area with good sound transmission. Incomplete intestinal obstruction and gastrointestinal bleeding. Conclusion: There is no other law for the relationship between metastatic small intestine tumor and the location and histological type of primary tumor.