Any Lesion on CT which is more black than the surrounding parenchyma is said to be Hypodense. If it is MRI, we should say it as Hypointense.
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A hypodense lesion refers to an area in the body, typically seen on imaging scans like CT or MRI, that appears darker than surrounding tissue due to reduced density. This can indicate various conditions such as a tumor, cyst, or area of infarction with decreased blood flow. Additional testing or evaluation is usually required to determine the underlying cause of the hypodense lesion.
Hypodense, just means less dense. So the tissue being described has a lower mass per unit of volume.
An example would be fat or muscle is hypodense when compared to bone.