Endoanal and endorectal ultrasound represents considerable progress in the field of anorectal imaging. Its importance in the staging of rectal and anal cancer, in identifying perianasto motic neoplastic recurrences, in defining acute and chronic suppurative disease and in assessing sphincteral anatomical integrity, is now a confirmed reality. The evidence provided by endoanal and endorectal ultrasonography guides the colorectal surgeon in his choice among the various therapeutic approaches and helps in assessing the effects of the treatments applied. The great flexibility and high degree of...