[Anal endosonography in the diagnosis of anal neoplasm].

Anal endosonography is a highly accurate imaging method in the diagnosis of rectal carcinoma. Its ability to visualise the layered structure of the anal canal enables local staging of the tumour of the anal canal. Also, the assessment of the perirectal tissues by means of endosonography, is useful in visualisation of enlarged lymph nodes. In patients after radiotherapy or chemotherapy, anal endosonography is used as the follow-up examination.