Papillary serous cystadenocarcinoma of the ovary is a common tumor but occurrence of ovarian type papillary serous cystadenocarcinoma in the testis is very rare. Herein we report such a case in a 49-year-old man presenting with testicular swelling. In this tumor, mesothelioma of tunica vaginalis should be excluded by immunohistochemistry. The best treatment is radial orchiectomy and it is very resistant to chemoradiation. Our case was well after orchiectomy and now after a year he is doing well and completely symptom free.
Keywords: testicular papillary serous cystadenocarcinoma..