5Urban M,Rosen HR,Holbling N,et al.MR imaging for the preoperative planning of sphincter saving surgery for tumors of the lower third of the rectum:use of intravenous and endorectal contrast materials[J].Radiology,2000,214(2):503 -508.
6Di Betta ED,Hoore A,Filez L,et al.Sphincter saving rectum resection is the standard procedure for low rectal cancer[J].Int J Colorectal Dis,2003,18 (6):463-469.
7Brown G,Richards CJ,Newcombe RG,el al.Rectal Carcinoma:Thin-Section MR Imaging for Staging in 28 Patients[J].Radiology,1999,211 (1):215 -222.
