Computed tomography of perirenal and pararenal inflammatory disease complicating renal calculi.

In the presence of unsuspected extensive perirenal and pararenal disease, renal calculus surgery may be associated with extensive morbidity and mortality. To plan surgery properly, computed tomography (CT) often can be essential preoperatively. Three cases are presented where CT readily demonstrated the degree of extrarenal extension. No other imaging modality can demonstrate this involvement as accurately and as easily.