The short answer
On a colon or rectal cancer pathology report, tumor deposits are small separate clumps of cancer cells in the fatty tissue near the bowel, not inside a lymph node. When lymph nodes are negative but deposits are found, NCI's staging table lists the N category as N1c. This page explains the term.
Tumor deposits are small clumps of cancer in the tissue around the bowel, separate from the main tumor and not inside a lymph node.
If no lymph nodes contain cancer but deposits are found, NCI's staging table lists this as N1c.
NCI's stage III description includes cancer cells in tissue near the lymph nodes, so deposits can place the cancer in stage III.
Your care team explains what this means for your treatment plan.
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This page is for anyone whose colon or rectal cancer pathology report mentions tumor deposits. It explains what they are, what N1c means, and what to ask your care team.
What a tumor deposit is
After surgery for colon or rectal cancer, the pathologist checks the main tumor, the nearby lymph nodes, and the fatty tissue around the bowel.
Sometimes they find a small, separate clump of cancer cells in that fatty tissue. It is not part of the main tumor, and it is not inside a lymph node. That clump is called a tumor deposit. Some reports give a count, such as "tumor deposits: 2."
Where tumor deposits fit in staging
Tumor deposits are recorded in the N category, the part of TNM staging that covers lymph nodes.
NCI defines N1c as: "No regional lymph nodes are positive, but there are tumor deposits in the subserosa, mesentery, or nonperitonealized pericolic, or perirectal/mesorectal tissues."
In plain terms, N1c means no lymph nodes had cancer, but deposits were found in the tissue around the bowel. The subserosa is a layer of the bowel wall. The mesentery is the tissue that holds the bowel in place.
If lymph nodes do contain cancer, the N category is based on how many nodes are positive. Ask your care team whether deposits were counted in your stage.
What this means for stage
NCI's patient summary describes stage III colon cancer as including cancer that has spread to nearby lymph nodes, or cancer cells that "have formed in tissue near the lymph nodes." That second part describes tumor deposits. So a report with no positive lymph nodes can still be stage III if tumor deposits are present.
Stage describes groups of people. It does not predict what will happen to you. Your care team uses the stage and the rest of the report to plan treatment after surgery.
How it relates to other report findings
Reports often list several related findings near each other. They are separate:
- Lymphovascular invasion: cancer cells inside small blood or lymph vessels.
- Perineural invasion: cancer cells along a nerve.
- Tumor deposits: separate clumps in the tissue around the bowel.
See What Does Lymphovascular Invasion Mean? and What Does Perineural Invasion Mean?
Ask these before you leave
- Were tumor deposits found, and how many?
- How many lymph nodes were checked, and were any positive?
- What N category and stage do I have?
- How does this affect treatment after surgery?
Related pages
See What Does N Stage Mean?, Colorectal Cancer Stages, and Understanding Your Pathology Report.
Sources
Common questions
What is a tumor deposit?
It is a small, separate clump of cancer cells in the fat or tissue near the bowel. It is not inside a lymph node.
What does N1c mean?
NCI defines N1c as no positive regional lymph nodes, but tumor deposits in the tissue around the bowel. It is part of the N category.
Is a tumor deposit the same as a positive lymph node?
No, but staging treats it in a similar way when lymph nodes are negative. Ask your care team how it affects your stage and plan.
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Sources last checked: 2026-10-02 what this meansLast updated: 2026-10-02Next planned review: 2027-09-27
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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.
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