Plain CT followed by CT cystogram (dilute contrast injected via the urethral catheter)
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Large fluid collections sitting in front of and behind the bladder. Bladder is collapsed with a urethral catheter in situ (and balloon in lumen). Contrast injected into the urethral catheter fills the bladder (extrinsically compressed by the collections) and leaks posteriorly into these collections via a defect in the prostatectomy cavity at the bladder base (thus these collections are urinomas).