1Glaser,F,Schlag P,Herfarth CH,et al. Endorectal ultrasonography for the assessment of invasion of recatal tumours and lymph node involvement. Br J Surg,1990,77:883-887.
2Garcia-Aguilar J,Pollack J,Lee SH,et al. Accuracy of Endorectal ultrasonography in preoperative staging of rectal turnouts. Dis Colon Rectum,2002,45(1) :10-15.
3Adams DR, Blatchford GJ, Lin KM, et al, Use of preoperative ultrasound staging for treatment of rectal cancer. Dis Colon Rectum, 1999,42 (2) : 159-165.