Incidental findings
Do All Incidental Findings — Need Investigation?
Finding something unexpected on a scan is frightening. But not every incidental finding needs urgent follow-up — and not every one can be ignored. Understanding the difference is the first step.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed September 2026
- Most are not cancer — The majority of incidental findings are benign variants, cysts, or changes unrelated to the primary reason for the scan.
- Some need prompt assessment — Findings that look irregular, have grown since a previous scan, or appear near important structures need review quickly.
- Many can be watched — A structured plan of repeat imaging at set intervals is a clinical decision, not a dismissal.
- Your team decides — The right next step depends on the imaging characteristics of your specific finding, your history, and current guidelines.
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Not every incidental finding needs urgent investigation. Some are benign variants that need no action; others need watching with repeat scans at set intervals; a few need prompt assessment. Your oncologist or the relevant specialist decides which applies to your finding based on its imaging characteristics, size, location, and your overall clinical picture.
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What do the terms in your scan report mean?
- Incidental finding
- Something seen on a scan that was not the reason for the investigation. Found by chance, not because a symptom pointed to it.
- Incidentaloma
- An incidental finding in a gland or organ that looks like a mass on imaging. The word does not mean it is cancerous.
- Indeterminate finding
- A finding whose nature the scan alone cannot establish. Additional imaging, a blood test, or a biopsy may be needed before a decision can be reached.
- Benign variant
- A feature that is normal in some people, or a known harmless change. No treatment and no further testing is needed.
- Active surveillance
- A structured plan of repeat scans at set intervals to monitor a finding over time. It is not the same as ignoring it.
- Correlate clinically
- Radiology language meaning the finding should be read alongside your symptoms and medical history. It does not by itself mean the finding is serious.
Which incidental findings need prompt attention?
A finding needs prompt assessment when its imaging features make an important diagnosis more likely. This includes findings that look irregular, appear to have grown since a previous scan, or are located near a structure where delay could matter.
A new symptom alongside the finding — unexplained pain, weight loss, or a change in how an organ works — moves it up the priority list.
A prompt referral to a specialist does not mean the finding has been diagnosed. It means more information is needed before any conclusion can be drawn.
Which findings can be watched rather than investigated straight away?
Many incidental findings are stable, small, and have imaging features that make a serious diagnosis unlikely. For these, a planned repeat scan at a set interval is appropriate — it confirms the finding is not changing without putting you through unnecessary procedures.
Structured watching pathways exist for several common findings, including small lung nodules and certain adrenal and thyroid findings. These follow guidance from bodies including NCCN and the British Thoracic Society.
Watching is a clinical decision, not dismissal. It means the finding does not need more information now, but should be checked at a defined future point.
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What to do when you are told about an incidental finding
- Ask what the finding is and which organ it is in.
- Ask whether it needs urgent assessment, a follow-up scan, or no action.
- Write down the name of the finding if one was given.
- Ask who is responsible for booking the follow-up — and when you will hear from them.
- Tell your team about any new symptom that has appeared since the scan.
- If you are in active treatment, ask whether this finding changes your current plan.
Questions this finding often raises
Does an incidental finding mean my cancer has spread?
This is the first fear most people have, and it is often the wrong conclusion. An incidental finding in a cancer patient is not automatically metastasis. It may be an unrelated benign structure, a cyst, an old scar, or a normal variation. Your oncologist will assess the imaging characteristics alongside your cancer type and history before drawing any conclusion. In many cases the scan itself makes the answer clear; in others, one additional test resolves it. Ask for the specific assessment rather than a yes or no.
Can I wait for my next routine appointment to discuss it?
It depends on how the finding has been classified. If it is watch-and-confirm, your next scan will be scheduled at the appropriate interval and waiting is the plan. If it has been flagged as needing prompt review, a routine appointment that is weeks away is not the right next step. Ask directly: does this need to be looked at before my next scheduled visit? If the answer is yes, ask how to arrange it.
I am worried about radiation from repeated scans. Should I decline the follow-up?
Radiation from diagnostic imaging is real, and the guidelines that set follow-up intervals take cumulative exposure into account when they are written. Declining a recommended follow-up means a changing finding goes undetected until the next routine scan, which may be months away. If you are concerned, ask your oncologist whether ultrasound or MRI is appropriate for your finding — some can be monitored without radiation. Do not decline without that conversation first.
My follow-up was never booked and no one has contacted me. What do I do?
Contact the clinic yourself. Explain that a follow-up was recommended and that you have not been contacted. Ask which department the referral was sent to, and call them directly if needed. A follow-up that has not been booked is not the same as one that is no longer needed. Do not assume that silence means the finding has resolved. If you cannot reach the right person, your oncologist's secretary can usually trace the referral.
Did you know?
Most incidental findings discovered during cancer imaging are benign or unrelated to the primary diagnosis.
NCCN and ESMO guidelines specifically caution against routinely investigating low-risk findings, because unnecessary procedures carry their own risks and rarely change outcomes.
Source: NCCN Clinical Practice Guidelines in Oncology; ESMO guidelines on management of incidental findings
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Common questions
Frequently asked questions
What exactly is an incidental finding?
An incidental finding is something seen on a scan that was not the reason for the investigation — found by chance, not because of a symptom. Incidental findings are common in cancer care because the imaging used is detailed and covers large areas of the body. Each one needs individual assessment rather than being assumed harmless or dangerous without review.
Who decides what happens next?
Your oncologist usually makes the first assessment and may refer you to a specialist in the relevant organ — a pulmonologist for a lung finding, an endocrinologist for an adrenal finding. The decision is based on imaging characteristics, size, location, whether previous scans exist for comparison, and your overall clinical picture. You should receive a clear explanation of which category the finding falls into and what the next step is.
What does indeterminate mean on my report?
Indeterminate means the scan alone cannot establish the nature of the finding. More information is needed — a different type of scan, a blood test, or occasionally a biopsy. It is not a diagnosis and is not the same as suspicious. It is an instruction to gather more information before reaching a conclusion. Your oncologist will tell you which test is most appropriate for your specific finding.
How long does a watching period last?
It depends on the finding and which guideline applies. Small lung nodules, for example, have structured protocols specifying repeat imaging at defined intervals based on size and appearance. Other findings may need only a single confirming scan. Ask how many scans are planned, what the interval is, and what the finding would need to show at the next scan to either end the watching period or trigger a different investigation.
Should I get a second opinion on the finding?
A second opinion is always reasonable, and for indeterminate findings it can be particularly useful. Radiological interpretation requires specialist skill, and some findings benefit from review by a radiologist who specialises in that organ. Bring the original report and the imaging disc or digital access link — a reviewing specialist needs to see the images, not only the report. Ask your oncologist for a referral, or ask your imaging centre to arrange it.
I have noticed a new symptom near the finding. What should I do?
Tell your team promptly — before your next scheduled appointment if the symptom is new or worsening. A new symptom near the site of an incidental finding, such as pain, swelling, or a change in how that organ functions, is relevant information that may change how the finding is classified. A brief call to the clinic is enough to establish whether you need to be seen sooner.