Emphysematous cystitis (EC) and emphysematous pyelonephritis (EPN) are the result of infection of the urinary bladder and kidneys by gas-producing microorganisms. Those infections are most often reported in diabetic patients and rarely occur concurrently. This article describes two cases of concurrent EC and EPN, one in a nondiabetic dog and the other in a diabetic cat. The use of diagnostic imaging is necessary in the diagnosis of emphysematous infections. Both radiography and ultrasonography were used in the diagnosis of EC and EPN in the patients described in this report.

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