Cyst
Read Your Scan Editorial Team·Last updated
Written from published radiology references and reviewed for plain language. Not written or signed by a physician, and not a diagnosis. How we write these pages →
In plain language
A fluid-filled pocket. On ultrasound, simple cysts have a typical, reassuring appearance.
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Where you'll see this
This wording turns up on Abdominal Ultrasound reports — Ultrasound imaging of the abdomen. An abdominal ultrasound shows the liver, gallbladder, bile ducts, kidneys, pancreas, spleen, and major blood vessels using sound waves. Doctors often order it for belly pain, to check the gallbladder or liver, to look into abnormal blood tests, or to follow up a known finding. It is safe, painless, and uses no radiation. The report describes what the images show; your doctor interprets it with your symptoms and other tests.
Questions worth asking your doctor
- What was the reason for this ultrasound, and did it answer that question?
- If gallstones were seen, do they need treatment or just watching?
- Is a finding like fatty liver something I can improve?
- Do any findings need a follow-up scan or a different test?
- Do the results change my current care in any way?
How common is this?
A cyst is a fluid-filled pocket with a wall around it, and cysts are among the most common findings in the entire body. They occur in the kidneys, the liver, the ovaries, the breast, the thyroid, the brain, joints and skin, and they become steadily more frequent with age. The vast majority are found by chance on scans done for something else.
When should I worry?
The word that matters is simple. A simple cyst — thin-walled, containing only fluid, with nothing solid inside and no contrast uptake — is benign, does not become anything else, and needs neither treatment nor follow-up. That description covers the overwhelming majority. What warrants attention is a cyst that is not simple: thick or irregular walls, internal divisions, solid components, or enhancement. Those are described in different words and, in several organs, graded by a formal system — Bosniak in the kidney, BI-RADS in the breast, TI-RADS in the thyroid.
What happens next
For a simple cyst, nothing at all: it is reported so it is documented rather than because anything is needed. For a complex one, the relevant scoring system determines whether follow-up, further imaging or a specialist opinion is appropriate. Very occasionally a large cyst causes symptoms by pressing on something, and drainage is then considered on the basis of symptoms rather than size.
Frequently asked questions
- Are cysts dangerous?
- Simple cysts are not. They are fluid-filled pockets that do not turn into anything and need no treatment. Cysts with complex features are described differently and are what would warrant further assessment.
- What makes a cyst simple?
- Thin walls, contents that are pure fluid, nothing solid inside, and no uptake of contrast. Radiologists check each of those, which is why cyst descriptions mention walls and enhancement rather than only size.
- Can a cyst turn into cancer?
- A cyst meeting the criteria for simple does not. The distinction is precisely why the complex features are described so carefully and why grading systems exist for cysts in particular organs.
Other words on the same report
Where this word comes up
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