Endoscopic ultrasonography with combination of miniature probe and radial scanning in preoperative staging for rectal cancer

Abstract

Objective To evaluate the specificity, sensitivity and accuracy of miniature probe combined with radial scanning endoscopic uhrasonography （EUS） in preoperative TN staging of rectal cancer, and to assess its value in the choice of therapeutic strategy. Methods A total of 60 patients with rectal cancer received EUS assessment before surgery. Diagnosis was made according to TNM standard and compared with those of MRI and postoperative pathological examination. The reference value of EUS for therapy selection was studied. Results According to EUS staging, there were 4 cases of T1, 18 T2, 30 T3 and 8 T4, among which 7 cases were over-staged and 4 others were under-staged. MRI staging showed 1 case of T1, 18 T2, 30 T3 and 10 T4, among which 14 were over-staged and 3 others were under-staged. The total accuracy of EUS in T staging and N staging was 81.67% （49/60） and 78.33%, respectively, with the sensitivity and specificity at 71.43% and 91.03%, respectively. Accuracy of MRI for T staging and N staging were 71.67% （43/60） and 83.33%, respectively, with the sensitivity and specificity as 85.71% and 86. 96%. Conclusion EUS with combination of miniature probe and radial scanning is effective in preoperative TN staging of rectal cancer with easy manipulation and less pain. Key words: Endosonography ; Colorectal neoplasms ; Neoplasm staging ; Magnetic resonance imaging