How to read a radiology report

I have opened a radiology report on my phone and tried to decode it before anyone called. That is a hard place to be. The report is written for the clinician who ordered the scan, not as a letter to you. A radiologist—a doctor who supervises imaging exams—reads the images and sends that write-up to your ordering provider. The medical terms are for that conversation.

This is not clinical evidence and not medical advice. It does not replace your care team. Discuss anything here with your clinician before you act on it.

This piece is CT, MRI, X-ray, ultrasound, PET—the imaging write-up. Not your lab numbers. Not the pathology report that names tissue. Those are different documents.

Where to look first

If you only have a minute, skip to the impression. RadiologyInfo calls that the bottom line—the summary of what matters most for decision-making. Then go back for the detail. Formats vary, but the same pieces keep showing up: type of exam, history or reason for the exam, comparison with older scans, technique, findings, and impression. NCI’s SEER training also lists potential limitations among the key parts.

Type of exam

Date, time, and what was done. A CT of the abdomen with contrast. A chest MRI. Confirm it matches the appointment you remember.

Why they ordered it

Usually labelled history or reason for exam. Symptoms, history, the question your clinician wanted answered. It helps the radiologist focus. Sometimes they also pull notes from your chart or the forms you filled out at check-in.

Comparison with older scans

If you have older imaging of the same area, the radiologist may list it here and compare. Same body part, often the same kind of exam. Bring priors from other hospitals when you can. A prior can show whether something is unchanged or new, and that can change what they recommend. I have sat through an appointment where half the conversation was “we need the older disc before we decide.”

Technique

How the scan was done, and whether contrast was used. Contrast helps some structures show more clearly; for CT and MRI it often goes in a vein when organs or vessels are the focus, but it is not always required. This section is mostly documentation. Useful to a radiologist on the next exam. Less useful when you are sitting with the PDF at night.

Findings

What the radiologist saw, area by area. Some write paragraphs. Others line up each organ. You may see “normal” or “unremarkable.” If an area was part of the exam but is not discussed, that usually means they looked and did not have a problem to flag for your doctor. Still ask if a blank line worries you.

Impression

This is the summary. The radiologist pulls the important findings together and may list possible causes—sometimes called a differential. For something abnormal or unclear, they may suggest another imaging test, a follow-up scan later, a biopsy, matching the finding to your symptoms or lab results, or comparing with imaging they do not have yet.

Sometimes the report does not answer the question the scan was ordered for. More testing may be next. The impression is one input. Your clinician still has to put it with your history, exam, and everything else.

When the exam was limited

Some reports note what got in the way—motion, incomplete views, missing priors. NCI SEER training lists potential limitations as a standard part of a radiology report. If you see that language, ask what it means for you. Do not fill in the blank yourself.

Incidental findings

Things the radiologist noticed that were not the main reason for the scan. Often they cause no symptoms and never change your care. Sometimes they do. RadiologyInfo notes that many findings on a scan are incidental and will cause no harm—and that you should ask your ordering doctor whether a finding is concerning. Some centres will also let you speak with the radiologist. I did not know that was allowed.

When the portal beats the phone call

Many of us see the report online before the ordering clinician has reviewed it. The wording is still aimed at them. Try not to decide what a phrase means alone. Something that looks alarming in isolation often turns out not to be a cause for concern once it sits next to the rest of your file. Write the questions down. Bring them in.

Questions I take in

What did this exam find that relates to why we ordered it? Which lines in the impression matter most for my situation? Are any findings incidental—and are any concerning? Do you want another scan, a lab, or a specialist visit, and what are you hoping to learn? Should we pull older imaging from another facility? Can I talk to the radiologist if the wording is still unclear after we meet?

Over months of care, imaging PDFs pile up across portals—CT next to MRI next to a PET from somewhere else. Keep dated copies next to your labs and visit notes so you are not hunting the night before an appointment. Triangle can help you keep imaging beside the rest of your records.