Abstract
We experienced three cases of prostate cancer which presented with an annular stricture of the rectum. Case 1 : A 65-year-old man suspected of having rectal cancer was referred to our department. He was diagnosed as having rectal involvement secondary to prostatic cancer from the high level of his serum PSA level and the positive PSA staining of the rectal biopsy specimen. Case 2 : An 82-year-old man suspected of having an intestinal obstruction due to rectal cancer was referred to our department and sigmoid colostomy was performed. Finally we diagnosed his condition as a rectal stricture secondary to prostatic cancer based on the findings of the prostate biopsy. Cases of prostate cancer directly invading the rectum are rare, however sometimes an annular stricture exists and the patients have dyschezia. Serum PSA and PSA staining of rectal biopsy specimens are useful diagnostic tools in these cases.
