What does “Hypoechoic” mean on a radiology report?
Ultrasound word for something that reflects less sound than the tissue around it and so looks darker. Describes appearance only.
How "Hypoechoic" is used in radiology reports
On ultrasound, tissue that reflects less sound than its surroundings looks darker. Radiologists call it hypoechoic. The related words are hyperechoic or echogenic (brighter), isoechoic (the same as the surrounding tissue), and anechoic (black, reflecting almost nothing — typical of clear fluid such as in a simple cyst).
Hypoechoic is one of the most common ultrasound words and one of the most misread. Many normal structures are hypoechoic, including lymph nodes, muscle and some cysts that contain thicker fluid. In breast and thyroid ultrasound, hypoechoic is one of several features that radiologists weigh together using scoring systems such as BI-RADS and TI-RADS; no single feature decides what something is.
So a "hypoechoic lesion" or "hypoechoic nodule" is a description of how something looks on the screen. The size, shape, edges and blood flow, and the radiologist’s overall conclusion in the Impression, carry the meaning.
If a report describes a hypoechoic area and recommends another test — a repeat ultrasound, an MRI, or a sample of tissue — that recommendation is the part to discuss with your doctor. It reflects the overall picture, not the single word.
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General explanations of common wording, not advice about your own scan. Ask the doctor who ordered it what your results mean for you.
Does this mean something is wrong?
Not on its own. A radiology report describes what the images show, in language written for the doctor who ordered the scan. One term is rarely the whole picture — what it means for you depends on why you were scanned and what else the report says.
If the report worries you, the person who can actually answer that is the doctor who referred you. Understanding the words first usually makes that conversation a better one.
Want your whole report explained?
One term is a start. Radily reads your full report and explains it in plain English — and can talk you through it on video, so you are not reading medical language alone.
Other technical terms
- ArtifactAn abnormal appearance on an image caused by the scanning process, not actual anatomy.
- AttenuationHow much X-rays are absorbed by tissue. Dense tissue (bone) shows high attenuation (bright), while air shows low attenuation (dark).
- AxialCross-sectional images taken in a horizontal plane, like slicing bread.
- ContrastA dye injected or swallowed to make certain tissues show up better on imaging.
- CoronalImages taken from front to back, dividing the body into front and back portions.
- DensityHow solid or compact tissue appears on imaging. High density = bright (bone), low density = dark (air).
This explains a term as it is commonly used in radiology reports. It is not a diagnosis and not medical advice. Discuss your own results with your doctor.