Objective To explore the value of transrectal contrast-enhanced ultrasound and color Doppler ultrasoundin the differential diagnosis of rectal cancer and rectal stromal tumor.MethodsAccording to the results of postoperativehistopathological examination

82 patients with rectal tumor were divided into rectal cancer group（n=53）and rectal stromaltumor group（n=29）.The maximum diameter

peak blood flow velocity

resistance index

maximum peak intensity（IMAX）

risetime（RT）

time to peak（TTP）and average transit time（MTT）of the two groups were compared.The accuracy of transrectalcontrast-enhanced ultrasound and color Doppler ultrasound in the differential diagnosis of rectal cancer and rectal stromal tumorwere analyzed.ResultsThe mean maximum diameter

peak flow velocity and resistance index of rectal cancer group weresignificantly higher than those of rectal stromal tumor group（all P<0.05）.Compared with the rectal stromal tumor group

theultrasonic manifestations of rectal cancer showed uniform internal echo

and most of the lesions surrounded the intestinal cavity

the differences were statistically significan（tall P<0.05）.The IMAX of contrast-enhanced ultrasound parameters in rectal cancergroup was higher than that in rectal stromal tumor group

and the RT

TTP and MTT were significantly lower than those in rectalstromal tumor group

and the differences were statistically significant（all P<0.05）.The accuracy rate of transrectal contrast-enhanced ultrasound in diagnosing rectal cancer was 98.11%（52/53）

the accuracy rate for diagnosing rectal stromal tumors was93.10%（27/29）

and the total accuracy rate was 96.34%（79/82）.The accuracy rate of ultrasonography in diagnosing rectalcancer was 86.79%（46/53）

the accuracy rate in diagnosing rectal stromal tumors was 89.66%（26/29）

and the total accuracyrate was 87.80%（72/82）.The total accuracy of transrectal contrast-enhanced ultrasound in the diagnosis of rectal cancer and thetotal accuracy of differential diagnosis of rectal cancer and rectal stromal tumor were significantly higher than those of colorDoppler ultrasound

and the differences were statistically significant（all P<0.05）.ConclusionThe value of transrectalcontrast-enhanced ultrasound in the differential diagnosis of rectal cancer and rectal stromal tumor is higher than that of colorDoppler ultrasound

which is worth popularizing.