[Value of dual contrast-enhanced ultrasound in the preoperative T staging of rectal carcinoma].

Objective To explore the value of dual contrast-enhanced ultrasound in preoperative T staging of rectal carcinoma. Methods Dual contrast-enhanced ultrasound examinations were performed on 72 patients with rectal carcinoma via transrectal infusion and intravenous injection. The accordance of preoperative dual contrast-enhanced ultrasound results and postoperative pathologic results was evaluated retrospectively. Results The overall accordance rate of preoperative T staging was 73.6% (53/72). And accordance rate was 100.0% (3/3), 100.0% (5/5), 68.4% (13/19), 71.4% (25/35)and 70.0% (7/10) for Tis , T1, T2, T3 and T4, respectively. The consistency was good (κ=0.607, χ2 =8.363, P<0.01). The accordance rate of middle/lower vs high rectal carcinoma was 68.7% and 85.7%. Conclusion Dual contrast-enhanced ultrasound can provide reference for preoperative T staging for patients with rectal carcinoma. Key words: Rectal neoplasms; Ultrasonography; Neoplasm staging