Diagnostic imaging term for a well-defined margin of a roundish low-density shadow seen in the liver. It is usually seen in hepatic hemangiomas, hepatic cysts, and focal nodular hyperplasia of the liver.
1. Hepatic hemangioma: Intrahepatic hemangiomas usually appear on imaging as round or round-like hypodense shadows with usually well-defined margins. The image may show an “early out, late in” pattern.
2. Hepatic cysts: Hepatic cysts are common benign lesions in the liver, which are mostly round-like in shape, with smooth and clear edges, and clearly demarcated from the surrounding area. They can be single or multiple.
3. Focal nodular hyperplasia of the liver: Focal nodular hyperplasia of the liver can be seen as single or multiple round-like foci in the liver on imaging, and the borders are usually clear, with uniform low density.
If you see rounded low-density shadows in the liver, it is recommended to improve the examination to clarify the etiology of the disease.