A rounded hypodense shadow in the liver parenchyma is a descriptive diagnosis of an intrahepatic lesion on CT and does not identify the specific type of lesion; further investigation is needed.
A CT scan that reveals a rounded lesion in the liver with an overall density lower than that of the liver parenchyma is described by the imaging physician as a rounded hypodense shadow. The corresponding lesion may be a liver cyst, hemangioma, adenoma, or small hepatocellular carcinoma, which requires a combination of enhanced examination, clinical history, and blood tests.
1. Intrahepatic cysts: basically no special symptoms, no obvious enhancement on enhanced scan.
2. Hemangioma: most of them are asymptomatic, and the enhancement scan shows blood sinusoidal changes with progressive enhancement.
3. Adenomas: prevalent in females, some of which have a history of contraceptive use, with marked enhancement in the arterial phase of the enhanced scan, followed by a decrease in the degree of enhancement, and liquefaction and necrosis can be seen in the center.
4. Small hepatocellular carcinoma: some of them have a history of cirrhosis, and the level of alpha-fetoprotein can be seen to be increased in laboratory tests, and the enhancement scan shows obvious enhancement in the arterial phase, and then the degree of enhancement decreases obviously.
CT examination reveals intrahepatic rounded low-density shadow, which is only a preliminary diagnosis and needs to be further investigated with clinical history to determine the specific cause before standardized treatment.