Benign prostatic hyperplasia is one of the most common pathological processes to afflict men. Strikingly, there is a large variety of methods of evaluation and therapeutic strategies for BPH in various countries. Before adequate treatment is possible, the process of benign adenomatous hyperplasia has to be distinguished from malignant or inflammatory prostatic disease. Furthermore, secondary alterations of the bladder and upper urinary tract have to be evaluated. A wide range of imaging techniques of the lower and upper urinary tract have evolved over the years. The specific benefits and restrictions of each of them are discussed. Finally, the recent developments and possibilities of computer-aided tissue characterisation and volume determination are outlined. The development of imaging techniques for BPH has just begun...