本文报道经病理或手术证实的大肠癌105例,术前作腔内 B 型超声检查67例,其中6例估计浸润层次过深,准确率91.0%,敏感性100%,CT 检查73例中3例估计浸润过浅,准确率95.9%,敏感性90.0%,CT 发现淋巴结的敏感性为68.9%。作者认为腔内 B 型超声可作为直肠癌术前常规检查,当 B 超显示癌肿穿透全层并浸润周围组织时可加做 CT. This article reported 105 cases of colorectal cancer confirmed by pathology or surgery. Preoperative B-mode ultrasonography in 67 cases, of which 6 were estimated to be too deep infiltration level, the accuracy rate was 91.0%, the sensitivity was 100%, CT examination in 73 cases 3 In cases where the infiltration was too shallow, the accuracy rate was 95.9% and the sensitivity was 90.0%. The sensitivity of lymph nodes detected by CT was 68.9%. The authors believe that intraluminal B-mode ultrasound can be used as a preoperative routine examination for rectal cancer. When B-mode ultrasound shows that the cancer penetrates through the whole layer and infiltrates the surrounding tissue, CT can be added.