Pararenal pseudocysts developed after an operation, after blunt and penetrating trauma or after contiguous disease processes in 16 patients. Nephrectomy was necessary in 8 cases. Although the duration of the pseudocyst and the extent of conduit injury did to an extent determine fate of the kidney, the location of the encapsulated extravasate and its propensity for curtailment of urine formation appeared to be more significant factors. The cases were reviewed in light of the individualization in management required for the complex problems they present.

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