Target lesion
Target Lesion
Target lesion (pronunciation: /ˈtɑːrɡɪt ˈliːʒən/), also known as a bull's-eye lesion or concentric lesion, is a term used in medical imaging to describe a certain appearance of abnormal areas where the center and the periphery of the lesion have different intensities.
Etymology
The term "target lesion" is derived from its resemblance to a shooting target, with a central "bull's-eye" surrounded by concentric rings.
Description
In medical imaging, a target lesion is characterized by a central area of one signal intensity, surrounded by a zone of different intensity, giving it a layered, or "target-like" appearance. This pattern can be seen in various imaging modalities, including ultrasound, CT, and MRI.
The appearance of a target lesion can be indicative of various medical conditions, depending on the organ in which it is found. For example, in the liver, target lesions may suggest hepatocellular carcinoma or metastasis. In the skin, a target lesion is a characteristic finding in erythema multiforme.
Related Terms
- Bull's-eye lesion: Another name for a target lesion, due to its resemblance to a bull's-eye on a target.
- Concentric lesion: A term used to describe the layered appearance of a target lesion.
- Hepatocellular Carcinoma: A type of liver cancer that can present as a target lesion on imaging.
- Metastasis: The spread of cancer from one part of the body to another, which can also present as a target lesion on imaging.
- Erythema Multiforme: A skin condition characterized by target lesions.
External links
- Medical encyclopedia article on Target lesion
- Wikipedia's article - Target lesion
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