What it is
A lung nodule is a spot up to about 3 cm seen in the lung tissue. They can come from old infections, scar tissue, inflammation, or benign growths. Larger spots are called masses and are followed more closely.
How common is it?
Very common. Nodules are found on a large share of chest CTs, and the great majority of small nodules turn out to be benign.
What's usually next
For small nodules, the usual next step is a follow-up scan after a set interval to confirm it is stable. Radiologists often reference Fleischner Society guidelines to recommend timing. Larger or irregular nodules may prompt earlier evaluation.
When it usually isn't — and when it might be — worrying
Usually reassuring
- Small size (often under 6 mm)
- Smooth, round edges
- Stable compared with prior scans
- Calcified (a sign of an old, healed process)
Worth discussing with your doctor
- Larger size or growth over time
- Irregular or spiculated (spiky) edges
- Personal history of significant smoking
Questions to ask your doctor
- 1How big is the nodule, and where is it?
- 2Do you have any prior scans to compare it against?
- 3When should the follow-up scan be, and why that interval?
- 4Do any of its features change what you recommend?
- 5What symptoms should prompt me to call sooner?
Educational use only. This explanation helps you understand terminology on your report. It is not a diagnosis, is not FDA-cleared, and does not replace your doctor. Bring questions to your care team.