Primary prostate transitional cell carcinoma is a very rare tumour originating in the transitional epithelial cells of the intraprostate periurethral ductus. Only 17 of 829 patients diagnosed with prostate carcinoma were found to have the transitional cell variety. Eight (8) of those had pure transitional cell carcinoma and 9 a mixed presentation of acinar adenocarcinoma and transitional cell ductal carcinoma. Bladder origin of the tumour was ruled out in all cases. We report a retrospective study on the clinical behaviour of prostate transitional cell carcinoma. Compared to acinar carcinomas, few differences were found when age, symptoms, physical findings and imaging diagnosis were evaluated. Clinical presentation, DRE, PSA, metastatic spread and presence of supravesical obstructive uropathy where also studied to establish a diagnosis. Radiotherapy was the most frequently used therapeutical approach. Mean survival is 26.6 months (4-60 months) and there has been 11 death up to now. Compared to acinar forms, this tumour shows a hormone-resistant, aggressive biological behaviour with poor prognosis. Early diagnosis and radical surgery are the only options available to increase life expectancy for these patients.