目的 :探讨经直肠超声诊断直肠癌的价值。方法 :使用双功超声诊断仪经直肠双平面探头 ,对怀疑为直肠肿瘤 4 5例患者进行检查 ,并将结果与临床最后诊断进行对比。结果 :经直肠超声对直肠肿瘤的诊断准确率 97.5 % ,明显高于临床初步诊断 (指诊 )的准确率 91%。结论 :经直肠超声检查直肠肿瘤具有很高的诊断和鉴别诊断价值 Objective: To investigate the value of transrectal ultrasound in the diagnosis of rectal cancer. Methods: Duplex ultrasound was used to examine 45 patients suspected of rectal neoplasms by transrectal bi-planar probe and the results were compared with the final clinical diagnosis. Results: The accuracy of rectal ultrasound in the diagnosis of rectal tumors was 97.5%, which was significantly higher than the accuracy of 91% in clinical diagnosis. Conclusion: Transrectal ultrasound examination of rectal tumors has high diagnostic and differential diagnostic value