What it means
Heterogeneous means the inside of something does not look uniform. Parts of it appear brighter or darker than others, usually because it contains a mix of materials. These can be fluid, fat, calcium or tissue with a different blood supply. The opposite is homogeneous, meaning even throughout. Radiologists use the word both for whole organs, such as the liver or thyroid, and for single lumps.
When it matters
On its own the word is neither reassuring nor worrying. A heterogeneous thyroid or liver often reflects a condition that affects the whole organ, such as inflammation or fat build-up. In a lump, an uneven inside can come from fluid, bleeding or calcium, and radiologists weigh it alongside size, edges and any growth. A scan with contrast or an ultrasound can help explain the pattern.
Questions to ask your doctor
- What is causing the uneven appearance on my scan?
- Is the heterogeneous look a concern here, or common for this organ?
- Would a different scan or a contrast scan explain it better?
