[Seminal Vesicle Cystadenoma with Concurrent Prostate Cancer : A Case Report].

This case report documents seminal vesicle cystadenoma with concurrent prostate cancer in a 49-yearold man evaluated at follow-up for a high prostate-specific antigen level (12 ng/ml). Transrectal ultrasound-guided prostate biopsy was performed for adenocarcinoma of the prostate (Gleason score 3+4= 7). Staging computed tomography showed a 6.6×5.5×5.0 cm cystic tumorof the seminal vesicle. A possible diagnosis of primary malignant tumor of the seminal vesicle with concurrent organ-confined prostate cancer was considered. However, seminal vesicle tumor biopsy was not performed because the patient underwent open radical prostatectomy with the resection of the seminal vesicle tumor. Histopathologic examination of the seminal vesicle and the prostate revealed cystadenoma (Gleason score 4+3=7) and adenocarcinoma (stage pT2cN0). Neither recurrence of the cystadenoma nor biochemical recurrence of the prostate cancer was observed 5 years and 6 months after the surgery.