A patient with three kidneys: a correlative imaging case report.

A man with three fully developed and well functioning kidneys was studied using correlative imaging. Renal scintigraphy and the renogram not only played a role in identifying the existence of three kidneys but also determined the level of function of each kidney. The use of renal scintigraphy and renography is pivotal in the diagnosis of supernumerary kidneys. An abbreviated review of embryogenesis is also given.