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History and CT images

History: A 61-year-old man presented with hematuria.

A CT urogram was obtained. Please see the sequences below. Click to enlarge the images.

Precontrast

The mass measures 38 HU.

Postcontrast (nephrograhic)

The mass measures 141 HU.

Delayed (12 minutes)

The mass measures 72 HU.