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A lung nodule does not necessarily mean cancer.
- Many nodules are benign, including scars or changes from a prior infection.
- Size, appearance, change over time, and your health history guide the evaluation.
- Bring prior scans when possible. Not every nodule needs a biopsy or operation.
Understanding the finding
What is a lung nodule?
A nodule is a small spot in the lung seen on imaging. It may be discovered during lung cancer screening or on a scan performed for another reason. Causes include a healed infection, inflammation, or scar tissue; sometimes a nodule is cancer.
The finding deserves an appropriate plan, but the word “nodule” alone does not tell us the cause. Your team considers the images together with your medical history.[1][4]
Putting the scan in context
What does the team look for?
- Size and appearance
- The scan report describes the nodule’s dimensions and features. Terms such as solid, ground-glass, or part-solid describe its appearance on CT; they do not by themselves establish a diagnosis.
- Change over time
- Comparing scans can show whether a nodule is new or has changed. Ask how to obtain earlier images from other hospitals, even when they were performed for an unrelated reason.
- Your medical history
- Age, smoking history, previous cancer, other health conditions, and the circumstances of the finding can affect the recommendation.
Screening scans and nodules found incidentally may be managed using different frameworks. There is no single follow-up schedule that applies to every nodule.[2][3]
A plan matched to the finding
What might happen next?
Comparison or repeat CT
For some nodules, reviewing old scans or scheduling another CT is the most useful next step. A follow-up plan should specify when the scan is due and who will review it with you.
Additional evaluation
Depending on the level of concern, further evaluation may include a PET/CT scan, a biopsy, or a surgical consultation. The most useful test depends on the nodule’s features and location and your health.
Why not biopsy every nodule?
A biopsy is not always necessary or informative, particularly for a very small spot. It also has risks. PET scans have limitations with small nodules. The team weighs whether a test is likely to change the plan before recommending it.
If surgery is considered, the discussion includes the reason for the operation, how much lung might need to be removed, your breathing reserve, and alternatives. A robotic approach is one surgical option; deciding whether to operate comes first.[1][4]
If cancer is suspected or diagnosed: the lung cancer guide →Keeping track
Make the next step clear
Keep a copy of the report and the recommended follow-up plan. If a scan is advised, confirm who will arrange it and how you will receive the result. Contact the team if the expected appointment or result discussion has not been arranged.
A second opinion can be useful when the finding is uncertain or you want to understand the reasoning behind observation, biopsy, or surgery.[2][3]
Preparing for a consultation →Questions to bring to your consultation
- How concerning is this nodule, and why?
- Have my earlier scans been compared?
- Do I need another scan, a biopsy, or another test?
- What are the benefits and limitations of the next step?
- When is follow-up due, and who will coordinate it?
About this guide
General patient education based on the resources below. Your team will tailor the evaluation to your imaging and health history.
Patient resources, references & image credits
Patient resources
- American Thoracic Society: What is a lung nodule?
- American Lung Association: Understanding lung nodule follow-up guidelines
- American Lung Association: Understanding your lung nodule report
- RadiologyInfo.org (ACR / RSNA): Lung nodules
Image credits
- Lung nodule CT teaching image. Image provided by Elliot Servais, MD, for this guide.
Updated October 4, 2026. This guide supports discussion with your care team and is not an individualized treatment plan.