Emphysematous urinoma in a renal transplant patient.

Urinary infection is a common complication after kidney transplantation. In some instances, especially with Escherichia coli infections, there is formation and collection of gas in the parenchyma and collecting system of the kidney, giving rise to the condition of emphysematous pyelonephritis. Such a process could occur in collections of urine (urinoma) secondary to ureteric leak in the transplant kidney. This process has not been described so far. In this report, we describe the first case of an infected urinoma with an interesting radiologic finding, a so-called emphysematous urinoma.