Review of the literature on calyceal diverticula, a hypothesis concerning its etiology and report of 17 cases.

The literature on calyceal diverticula is reviewed, the embryological aspects and pathogenesis are discussed and commented upon, and the ""congenital vasocentric'' theory of the authors is elaborated. The study includes the analysis of 17 cases seen over twenty years at the Department of Urology, Semmelweis University Medical School, Budapest.