What is the common presentation of focal nodular hyperplasia on a liver scan?

Focal nodular hyperplasia (FNH) is a benign liver lesion that often presents with a characteristic appearance on imaging studies, particularly on contrast-enhanced scans. The typical imaging features of FNH reveal increased uptake of contrast material, which is why it is referred to as "hot" on scan. This hypervascularity occurs due to the presence of a central scar and the abundant arterial supply associated with FNH.

On imaging, the lesion usually demonstrates a well-defined margin and, when enhanced with an appropriate contrast agent, it will show hyperattenuation relative to surrounding liver tissue during the arterial phase, followed by a decrease in enhancement during the venous phase. This enhancement is a key distinguishing feature of FNH, setting it apart from other hepatic lesions like hepatic adenomas or hepatocellular carcinoma, which might present differently on scans.

Thus, the "hot" characteristic on liver scans aligns with the known vascular behavior of focal nodular hyperplasia, making this option the correct answer.