5Cataldo PA, Senagore A, Luchtefeld MA. Intrarectal ultrasound in the evaluation of perirectal abscesses [J]. Dis Colon Rectum, 1993, 36 (6): 554-558.
6Graf D, Aeberhard P. Imaging of peri-anal and perirectal abscesses and fistula using endoluminal ultrasound diagnosis [J]. Swiss Surg, 1995, (6): 294-297.
8Stoker J,Hussain SM,Lameris JS.Endoanal magnetic resonance imaging versus endosonography.Radiol MedTorino,1996,92(6):738
9Mark H. Whiteford M.D.,John Kilkenny M.D.,Neil Hyman M.D.,W. Donald Buie M.D.,Jeffrey Cohen M.D.,Charles Orsay M.D.,Gary Dunn M.D.,W. Brian Perry M.D.,C. Neal Ellis M.D.,Jan Rakinic M.D.,Sharon Gregorcyk M.D.,Paul Shellito M.D.,Richard Nelson M.D.,Joe J. Tjandra M.D.,Graham Newstead M.D..Practice Parameters for the Treatment of Perianal Abscess and Fistula-in-Ano (Revised)[J]. Diseases of the Colon & Rectum . 2005 (7)
10Domkundwar SV,Shinagare AB.Role of transcutaneous perianal ultrasonography in evaluation of fistulas in ano. Journal of Ultrasound in Medicine . 2007