[Large abdominal mass: an unusual clinical form of prostate cancer]

Contribution of one case of prostate cancer presenting with a large abdominal mass associated to anaemia and weight loss. Serum PSA level was greater than 10,000 ng/mL. Imaging studies showed large retroperitoneal mass that led to other differential diagnoses. Biopsy revealed findings suggestive of adenocarcinoma with a distinct immunohistochemical pattern. No metastasis was evidenced in bone scan. Complete hormonal blockade resulted in significant decreased PSA levels and almost complete involution of adenopathies, as well as overall improvement.