The echo appearance and blood supply of rectal tumors was analyzed, with the peak systolic velocity (PSV), end diastolic velocity (EDV), resistance index (RI) in tumors vessels assessed.

• 结果腺瘤肠壁层次清晰,肿瘤多为高回声,直肠癌正常肠壁层次消失,肿瘤为低回声。