Incidental Finding — What It Means on Your Imaging Report
Quick Answer
An incidental finding is something unexpected that shows up on your scan when the doctor was looking for something else — most are harmless.
What Is an Incidental Finding?
An incidental finding — sometimes called an "incidentaloma" when it is a growth — is something a radiologist notices on your images that was not the reason the scan was ordered. For example, you might have a CT scan to evaluate abdominal pain, and the radiologist happens to notice a small cyst on your kidney that has nothing to do with your symptoms.
This is very common. Modern imaging technology, especially CT and MRI, produces incredibly detailed images. These scans show not just the area of concern but also nearby organs and structures. The more detail a scan captures, the more likely it is to pick up small variations that would never have been noticed otherwise.
Think of it like getting your car inspected for a strange engine noise. The mechanic fixes the engine but also mentions that a tire is slightly worn. The tire was not the reason you brought the car in, but now that it has been spotted, you can keep an eye on it.
When You Might See This on Your Report
Incidental findings are especially common on:
- CT scans — the most frequent source, because CT creates detailed cross-sectional images of large body areas. Studies published in radiology literature show that incidental findings occur in up to 40% of abdominal CT scans.
- MRI scans — high-resolution images often reveal small findings in the brain, spine, or abdomen
- Ultrasound — thyroid nodules and liver cysts are commonly found incidentally
- X-rays — less detailed, but incidental findings still occur (for example, a lung nodule on a chest X-ray ordered for rib pain)
Your report may use phrases like "incidentally noted," "incidental finding of," or "additionally noted" to describe these discoveries.
Should I Be Worried?
Most incidental findings are harmless. The vast majority turn out to be benign conditions such as simple cysts, small nodules, fatty deposits, or minor anatomical variations that are perfectly normal. Many people walk around their entire lives with these findings and never experience any symptoms.
However, some incidental findings do require follow-up. Your radiologist will typically include a recommendation in the report — such as a follow-up scan in 6 or 12 months — if they believe the finding needs monitoring. The American College of Radiology (ACR) publishes guidelines called the Incidental Findings Committee White Papers that help radiologists decide which incidental findings need follow-up and which can be safely ignored.
The key point: an incidental finding is not a diagnosis. It is a starting point for your doctor to decide whether any further action is needed.
What Should I Do Next?
- Read the Impression section of your report carefully. The radiologist will indicate whether the incidental finding needs follow-up or monitoring.
- Talk to the doctor who ordered your scan. They will determine whether the finding is relevant to your health or can be safely monitored.
- Follow any recommended follow-up imaging. If the report suggests a repeat scan in 6 or 12 months, make sure to schedule it. These follow-ups are usually precautionary.
- Do not panic. An incidental finding is not the same as a diagnosis. Most of the time, it simply means the scan was thorough enough to catch something small and likely insignificant.
- Keep a record of the finding so it can be tracked over time if needed.