The short answer
A scan and a pathology report are different kinds of tests, so they can describe the same cancer differently. Ask your care team which report your plan is based on and what any difference means.
A pathology report describes a tissue sample: its size as seen by the naked eye (gross description) and its cells under the microscope (microscopic description).
NCI says lymph nodes are called positive if they have cancer cells and negative if they do not.
Do not try to reconcile the numbers yourself. Ask your care team which report your plan is based on.
NCI says patients interested in a second opinion should talk with their doctor, who can help get the slides or paraffin block.
On this page
Choose how you want to read this
The whole article, with every detail and caution.
This page is for anyone who has noticed that a scan report and a pathology report describe the same cancer differently. It explains why that happens and which report usually guides treatment.
Two Tests, Two Different Questions
A scan and a pathology report are different kinds of tests, so they can describe what sounds like the same tumor in different terms. A scan produces images of the inside of the body. A pathology report describes a tissue sample.
What a pathology report describes
NCI says the gross description gives the color, weight, and size of a tissue sample as seen by the naked eye. The microscopic description gives the appearance of the cells after they have been stained and viewed under the microscope. NCI says lymph nodes are called positive if they have cancer cells and negative if they do not.
Stage at diagnosis
NCI says a cancer is always referred to by the stage it was given at diagnosis, even if it gets worse or spreads.
What to ask
Do not try to reconcile the numbers yourself. Ask which report your treatment plan is based on, and whether the difference changes anything. NCI says patients interested in getting a second opinion should talk with their doctor. They will need to obtain the slides or paraffin block from the pathologist who examined the sample.
Sources
Common questions
The scan said one size and the pathology said another. Was one wrong?
Not necessarily. They are different kinds of tests. A pathology report gives the size of a tissue sample as seen by the naked eye and describes cells under the microscope. Ask your care team what the difference means for you.
Which report does my treatment plan follow?
Ask your care team. They can tell you which results your plan is based on.
My scan said the lymph nodes looked suspicious but pathology found none. How?
NCI says lymph nodes are called positive if they have cancer cells and negative if they do not. A scan and a pathology report look at lymph nodes in different ways. Ask your care team to explain how the two results fit together.
Does my stage change if pathology disagrees with the scan?
NCI says a cancer is always referred to by the stage it was given at diagnosis, even if it gets worse or spreads. Ask your care team how new results affect your care.
Questions to ask your doctor
Being prepared helps you get the most out of your appointments. Save or print these questions.
Tap a question to save it to your list (kept on this device).
More words from this kind of report
Other guides in reading any report.
Talk with a trained specialist or navigator
Cancer Explained provides educational guidance, but does not replace trained specialists, social workers, or your medical team.
Talk to a trained cancer information specialist
Free, confidential assistance from NCI Cancer Information Service via phone, chat, or email.
Contact your oncology team
Locate after-hours contact numbers, portal messages, or urgent triage phone lines.
Find a patient navigator
Get one-on-one help with appointments, logistics, translation, and care coordination.
Find a genetic counselor
Discuss inherited mutation risk, family history, and genetic testing options.
Find an oncology social worker
Access emotional counseling, family support groups, and mental health resources.
Find a financial navigator
Locate copay assistance foundations, grant programs, and lodging/travel support.
Find a clinical-trial specialist
Search matching studies and speak with NCI trial information specialists.
Get urgent help
Fever of 100.4°F (38°C) or higher during chemo, severe pain, or trouble breathing: call your cancer care team right away, day or night. Call 911 for an emergency.
Plain-language explanation of the published sources cited on this page. AI-assisted, source-checked, not clinician-reviewed.
Written by: Cancer ExplainedSources last checked: 2026-07-30 what this meansLast updated: 2026-10-16Next planned review: 2027-07-30
Review details and limits
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes, and this is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status — Source checked. This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
General education — varies by person. Answers genuinely differ between people. This page explains what commonly varies and points you to your care team for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
Words to know
Tap any term to see what it means.
How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes, and this is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
Read more about our editorial process, our use of AI, and our corrections policy.
Spotted a problem? Report an error — a factual mistake, broken or outdated source, confusing wording, or anything that seems unsafe. Please do not include names, medical record numbers, dates of birth, addresses, or other identifying medical information in your report.
After using this page, do you understand what to do next?
Anonymous — we only record the answer, never who gave it.