How to read a radiology report: what the terms actually mean

Radiology reports are written by radiologists — specialist doctors who interpret medical images — for the clinical team ordering the scan. They assume a reader who already understands anatomy, pathology terminology and clinical context. When a copy lands directly in a patient's hands, the language can feel dense and alarming even when the findings are minor.

This guide unpacks the standard structure of a radiology report and explains the most common terms you're likely to encounter, so you can read your own results with confidence.

The standard structure of every radiology report

Most radiology reports follow the same basic format, regardless of the type of scan or the imaging centre that produced it.

• **Patient and study information** — your name, date of birth, the date of the scan, and the name of the requesting clinician.
• **Type of examination** — the modality (X-ray, CT, MRI, ultrasound, PET) and the body region imaged, sometimes including whether contrast dye was used.
• **Clinical indication** — the reason the scan was requested. This tells the radiologist what the ordering doctor is looking for and often frames how the findings are described.
• **Technique** — a brief description of how the scan was performed. For CT this includes slice thickness; for MRI it includes the field sequences used.
• **Findings** — the main body of the report. The radiologist describes what they can see, working systematically through each anatomical structure in the image.
• **Impression (or Conclusion)** — a summary of the key findings and the radiologist's interpretation. This is the section most relevant to your care.

Decoding the Findings section

The Findings section is where most of the unfamiliar vocabulary appears. Here are the terms patients most often ask about:

• **Unremarkable** — normal. One of the most reassuring words in a radiology report, despite its understated tone. 'Unremarkable liver' means the liver looks normal.
• **No acute findings** — nothing requiring urgent attention is visible. This doesn't mean the image is completely clear — it means nothing needs to be acted on immediately.
• **Density / attenuation** — a description of how bright or dark a structure appears on a CT scan. Fat appears dark (low attenuation); bone appears bright (high attenuation). An 'area of increased density' may indicate a collection of blood or calcium.
• **Lucent** — an area that appears darker than surrounding tissue, often indicating air or fat.
• **Opacity** — an area that appears brighter than expected. In a chest X-ray, a pulmonary opacity can represent fluid, infection, tumour or scar tissue — context determines which.
• **Mass / lesion / nodule** — a detectable abnormality. 'Mass' tends to mean larger; 'nodule' means smaller (typically under 3 cm). The terms themselves don't indicate whether something is benign or malignant.
• **Enhancement** — a structure that becomes brighter after contrast dye is injected. Enhancement pattern can help distinguish between types of tissue.
• **Effusion** — fluid in a space where it isn't normally found. A pleural effusion is fluid around the lung; a pericardial effusion is fluid around the heart.
• **Stenosis** — narrowing of a vessel or duct.
• **Calcification** — deposits of calcium in tissue, appearing bright on CT. Calcifications can be entirely benign (as in old healed injuries) or clinically significant depending on their location and pattern.

Understanding the Impression section

The Impression is the part that matters most for your care. It summarises the radiologist's conclusions and often ends with a recommendation — such as 'correlation with clinical findings suggested', 'follow-up CT in six months recommended', or 'no significant interval change.'

Pay attention to qualifying language. Phrases like 'cannot exclude', 'suspicious for', or 'consistent with' indicate uncertainty and are the radiologist's way of saying the image is suggestive but not definitive. They do not mean a diagnosis has been made. Phrases like 'no evidence of' or 'within normal limits' are more reassuring.

"Patients receiving their own imaging reports is one of the best things to happen in modern medicine. Read with curiosity, not fear — and always bring your questions to the conversation."

Dr. Lina Haddad, CMO, Looms

Common phrases and what they actually mean

• **'Within normal limits'** — the measured value or appearance falls within the expected normal range.
• **'Grossly unremarkable'** — broadly normal, no major abnormality identified.
• **'Interval change'** — a change compared to a previous scan. 'No significant interval change' is generally reassuring. 'New interval change' flags something that has appeared or worsened.
• **'Correlate clinically'** — the radiologist is saying that the image alone doesn't give the full answer; it needs to be interpreted alongside your symptoms and examination findings.
• **'Cannot exclude'** — the image doesn't rule out a possibility. This is a hedge, not a diagnosis.
• **'Incidental finding'** — something noted that wasn't what the scan was ordered to look at. Incidental findings can range from completely inconsequential to clinically important.

When to be concerned — and when not to

Radiology reports often contain findings that sound alarming in plain English but are clinically unremarkable. A 'hypodense hepatic lesion' sounds serious; in most cases it is a simple benign cyst. A small pulmonary nodule found incidentally in a non-smoker is usually monitored rather than treated.

The time to act urgently is when the Impression uses words like 'acute', 'emergent', 'highly suspicious for malignancy', or 'immediate clinical correlation required'. Your requesting doctor will already have seen these flags, but if you receive results before speaking to your doctor, contact them promptly.

Keeping your imaging reports for the long term

Radiology reports become more valuable over time, not less. A report from three years ago is the baseline against which your radiologist compares today's images. Without it, small but meaningful changes can be missed.

Looms stores your radiology reports and imaging records in a searchable archive. When you attend any follow-up scan, you can share the relevant prior reports directly with the imaging centre — giving the radiologist the context they need to detect interval change.