Occult prostatic carcinoma (carcinoma diagnosed because of the presence of metastasis) is commoner and commoner; the sites for metastatic disease are progressively more diverse. This is partially due to the longer life of the general population and to the better expectative of life for oncologic patients with modern treatments. We report the first case to our knowledge, of occult prostatic carcinoma diagnosed in a patient with a parenchymatous acute renal failure secondary to diffuse metastatic infiltration. We also review other atypical locations of metastasis from prostatic carcinoma reported in the literature and discuss the ways of spread in these cases.