Abstract
Here we reported a case of man in his sixties who presented rectal stenosis due to the invasion of prostatic cancer. He was referred to our hospital with a chief complaint of frequent defecation which had been present for one month. The barium enema showed a circular stenosis of the lower rectum. Colonoscopy revealed luminal stenosis and edematous redness of the rnucosa. Both computed tomography(CT)and magnetic resonance imaging(MRI)revealed an enlarged prostate and an increased thickness of the rectal wall;the border between the prostate and the rectal wall was indistinct. The patient's serum prostate-specific antigen level was high.Rectal biopsy and transrectal needle biopsy of the prostate were done. On histopathology, a poorly differentiated prostatic adenocarcinoma was diagnosed. Thus, the lesion was diagnosed as a prostatic cancer with rectal invasion. The patient had a colostomy and was given hormone therapy. Eight months later, the prostate's volume returened to normal, the rectal stenosis had disappeared, and the PSA had returned to normal. This is a rare case of rectal invasion of prostatic cancer, and highlights the fact that this type of lesion should be in the differential diagnosis of the diffuse type of rectal cancer.
