[Stenosis of the rectum secondary to an invasive adenocarcinoma of the prostate. Apropos of 3 cases].

There exist rare cases in which a prostatic carcinoma invades the perirectal space producing an extrinsic rectal stenosis. Three cases are discussed. Differential diagnosis with a rectal tumor is difficult clinically, but endorectal ultrasound and deep rectal biopsies must provide the correct diagnosis in most cases. Hormonotherapy is recommended, but prognosis is reserved.