Polo Mint sign (venous thrombosis)
The Polo Mint sign is a description given to a venous thrombosis on contrast-enhanced CT imaging. When viewed in the axial plane, a thin rim of contrast persists around a central filling defect due to thrombus. This gives an appearance like that of the popular UK mint sweet, the Polo, also referred to as the advertising slogan 'The Mint with a Hole'.
It was originally described to refer to the appearances of a pulmonary embolus on CT pulmonary angiography, but the appearances are the same for any venous thrombosis, such as in the portal vein 1.