Transrectal Ultrasound Findings of Prostate Cancer Mimicking Primary Rectal Tumor

Abstract

Two patients with disseminated prostatic cancer underwent transrectal ultrasonographic examination. In the rectal wall, at the prostatic level, tumor infiltration was seen without obvious communication to the prostate. Biopsy demonstrated adenocarcinoma, and immunohistochemic staining for prostatic specific antigen (PSA) was positive. We recommend the application of PSA staining in biopsy specimens of unclear rectal masses.