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Hypoattenuating lesions can represent anything from benign abnormalities like cysts which contain fluid to cancerous abnormalities like tumors and metastasis (cancer spread). The term is used by radiologists to describe the abnormality to someone reading the report.
Hypoattenuated, or low-density, areas appear darker on CT scans than hyperattenuated, or high-density, areas. The most dense body parts, such as bone, appear the brightest. As stated on MedPix, blood clots and tumors in the brain appear whiter than brain matter.
A hypoattenuating lesion is an area on an organ that appears brighter than the rest of the organ on an X-ray or CT scan. The brighter area on the image of the organ indicates some sort of abnormality to the surface.
Hypoattenuating lesion — this is a term that a radiologist uses to describe the appearance of a findings in comparison to the density of the organ around it. It often means the radiologist has detected a benign cyst in an organ.
Definition. Describes areas on an x-ray or CT scan that show up as darker than surrounding tissues. [from NCI] Term Hierarchy. GTR; MeSH; C Clinical test, ...
In summary, attenuation in radiology is the reduction in the intensity of a signal or beam as it passes through the body’s tissues. It is a fundamental concept in medical imaging that impacts the quality of diagnostic images.
It is common to find too small to accurately characterize lesions in the kidneys on CT. These are spots in the kidney which are usually under a centimeter in size. They are too small to characterize or say what they are. Most are tiny cysts or other benign lesions.