What does “Subcentimeter nodule” mean on a radiology report?
A small round spot less than one centimetre (10 mm) across — most often seen in the lung, thyroid or liver, and usually harmless.
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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.
Why the radiologist wrote it that way
"Subcentimeter" simply means smaller than a centimetre. Radiologists use it as a size label because size is the first thing that decides how much attention a nodule needs. Modern CT is detailed enough to show tiny spots that would have been invisible a generation ago, and the radiologist reports them rather than leave them unmentioned.
Is this good or bad news?
Small nodules are extremely common, especially in the lungs, where scars from old infections and small lymph nodes are found on a large proportion of chest CTs. The great majority of subcentimeter lung nodules are benign. What happens next depends on the exact size, what the nodule looks like, and your own risk factors such as smoking history: for lung nodules, radiologists and doctors follow published guidance such as the Fleischner Society recommendations, which for the smallest nodules in lower-risk people often advise no follow-up at all, and for others a repeat scan to confirm the nodule is not growing. Stability over time is the usual way a small nodule is shown to be harmless.
What it does not mean
- That cancer has been found. Size labels describe the spot, not its cause.
- That a follow-up scan means the radiologist is worried. Repeat imaging is the standard way to confirm a small nodule is stable.
- That it needs removing or a biopsy. Spots this small are rarely biopsied; they are usually watched, if anything.
Where you will see it
Words in this phrase
- NoduleA small, round growth or lump. Can be benign or malignant.
- PulmonaryRelated to the lungs.
- LesionAny abnormal area of tissue - can be benign or malignant.
- BenignNot cancerous. A benign growth is non-life-threatening.
- CalcificationCalcium deposits in tissue. Can be normal (aging) or indicate old injury, infection, or other conditions.
One phrase is not the whole report
What this sentence means for you depends on everything else your report says. Radily reads the whole thing and explains it in plain English — and can talk you through it on video, so you are not reading medical language alone.
Other phrases on your report
- Cannot be excludedThe images are not able to completely rule this out — which is a statement about the limits of the scan, not a suggestion that it is likely.
- NonspecificThe finding is real, but its appearance is not distinctive enough to say what is causing it.
- Small pleural effusionA small amount of fluid has collected in the space between the lung and the chest wall.
- Hepatic steatosisFat has built up in the liver — commonly called fatty liver.
This explains how a phrase is commonly used in radiology reports. It is not a diagnosis, not a reading of your scan, and not medical advice. Only your doctor can tell you what your own report means.