Urology deals with the urinary organs, e.g. with kidney, bladder, ureters and urethra.
Urologists also treat diseases of the sexual organs of man, i.e. the testes, epididymis, vas deferens, seminal vesicles, penis, and the prostate and thus cover areas of Andrology. There is an overlap of nephrology, gynecology, neurology, oncology and surgery.