What should you know about a non-FDG-avid lung nodule?

FDG uptake reflects glucose use. Some cancers use less glucose, and very small nodules may be difficult for PET to characterise. Infection, inflammation, scar tissue, and other non-cancer causes can also produce different scan appearances.

Doctors combine the PET result with the nodule's size, edge, location, density, smoking history, previous cancer history, and whether it changes on earlier or later CT scans. A stable or low-activity finding may lead to imaging follow-up, while a changing or suspicious finding may need tissue sampling.

Keep the recommended follow-up appointment even if you feel well. A CT scan can measure the nodule and compare its appearance over time. If imaging remains concerning, a biopsy may be considered; the safest route depends on the nodule's position and your health.

Bring previous chest scans if they were done elsewhere, and tell the team about smoking, occupational exposures, recent infections, and past cancer treatment. Do not stop prescribed medicines without advice.

Seek urgent care for severe breathlessness, coughing up more than a small amount of blood, chest pain with faintness, or sudden deterioration. Contact your clinician promptly for new persistent cough, worsening breathlessness, unexplained weight loss, or recurrent chest infections.

Ask how large the nodule is, whether it has changed, what its CT features show, when repeat imaging is due, and what would make biopsy or another test appropriate.