Improvement in T-staging of rectal carcinoma: using a novel endorectal ultrasonography technique with sterile coupling gel filling the rectum.
Our purpose was to study the accuracy of using endorectal ultrasonography (ERUS) with sterile coupling gels filling the rectum in the preoperative T-staging of rectal carcinoma. A total of 189 patients with confirmed rectal carcinoma were recruited. All underwent ERUS and surgery within the week following sonography. EURS was performed by introducing sterile coupling gel into the rectum. Two radiologists looked at the images at the same time and agreed upon staging. Rectal carcinoma was staged from Tis to T4. The accuracy of T-staging by ERUS was 89.95%. The sensitivity, specificity, PPV and NPV for ERUS at different stages were calculated. For early stage (Tis and T1), these values were 93.62%, 97.89%, 93.62% and 97.89%, respectively. ERUS filling with sterile coupling gel in the rectum overcomes the pressure effect from a water bath and the restriction caused by tumor stenosis, thus, greatly improving the accuracy of T-staging. The examination is real-time, safe and inexpensive.
Department of Diagnostic Imaging, Cancer Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China.
Yong
Y
Wang
Chun-Wu
CW
Zhou
Yu-Zhi
YZ
Hao
Lin
L
Li
Shang-Mei
SM
Liu
Xiao-Li
XL
Feng
Zhi-Xiang
ZX
Zhou
Vivian Yee-Fong
VY
Leung
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019160:Endosonography / Q000379:methods*; D005260:Female; D005782:Gels; D006801:Humans; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D009367:Neoplasm Staging; D011237:Predictive Value of Tests; D012004:Rectal Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D012680:Sensitivity and Specificity
D005782:Gels