Mild, moderate, severe
Read Your Scan Editorial Team·Last updated
Written from published radiology references and reviewed for plain language. Not written or signed by a physician, and not a diagnosis. How we write these pages →
In plain language
A radiologist's three-step scale for how much of something there is. The grading is a visual judgement rather than a measurement, so two radiologists can reasonably differ by a step — and severity on a picture does not always match severity in symptoms.
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Where you'll see this
Attached to almost any finding that comes in degrees: narrowing, arthritis, swelling, thickening.
Your report may word it “Minimal”, “Marked” or “Advanced”. These mean the same thing.
Questions worth asking your doctor
- In plain terms, how big or how serious is what you are describing?
- Does this description point to one likely cause, or several?
- Does anything here explain the symptoms I came in with?
How often does this turn up?
These three words grade almost everything in radiology — narrowing, wear, effusions, stenosis, degeneration — and they appear on nearly every report. What is rarely appreciated is that for most findings there is no measured scale behind them. They are visual impressions, and two radiologists reading the same images will not always choose the same word.
Does it mean something is wrong?
The grade is far less decisive than it sounds, and treating it as a measurement is the most common way these reports get over-read. For degenerative findings in particular, the grade correlates poorly with symptoms: people with severe changes are often comfortable and people with mild ones are often not. There are exceptions where the grading is formalised and does carry weight — some vascular narrowing, some standardised scoring systems — and those are usually named explicitly rather than left as a bare adjective.
What to do with it
Treatment follows symptoms rather than grades in most of musculoskeletal and degenerative medicine. Where a grade matters, it is usually because it crosses a threshold in a named system, and the report says which. If a word like severe worries you, the useful question is not how bad the grade is but whether that finding explains what you actually feel.
Frequently asked questions
- Is there a standard for mild, moderate and severe?
- For most findings, no. They are visual impressions rather than measurements, which is why the same images can be graded differently by different readers. Some specific systems do define thresholds, and those are named in the report.
- Does severe mean I need surgery?
- Not by itself. Surgical decisions rest on symptoms, function and response to conservative treatment, not on an adjective in a report. Severe findings in someone with no symptoms are common and are generally left alone.
- Why did two reports grade the same thing differently?
- Because the grading is subjective for most findings, and because technique and positioning differ between studies. A change in wording between reports does not reliably mean a change in the underlying finding.
How a finding is described
Where this word comes up
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Read Your Scan is informational only — not a medical diagnosis, and not a substitute for a licensed radiologist or your doctor. If you have urgent symptoms, seek care.