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Colonoscopy
A clinician examines the inside of the colon and identifies tissue that may require sampling.
Colon Cancer Pathology Support
Understanding Your Colon Cancer Pathology Report
Get a clearer explanation of the diagnosis, tumour type, depth of invasion, lymph nodes, margins, high-risk features, and biomarker results documented in your colon pathology report.
Not sure which service you need? Compare your options →This consultation helps you understand existing pathology results and prepare questions for your care team. It does not replace diagnosis, complete staging, or treatment planning by your treating clinicians.
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Board-Certified Pathologist
Professional pathology-report guidance
Secure Virtual Appointment
Meet online from the comfort of home
Patient-Friendly Explanation
Clear language for complex report findings
Educational Support
Not a replacement for medical advice
Understanding the Process
How Colon Cancer Is Confirmed
A colonoscopy may identify an abnormal area or growth. Tissue is then collected so a pathologist can determine whether cancer is present. When surgery follows, the resection specimen can provide substantially more information than the initial biopsy.
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Biopsy
A small tissue sample is collected from the abnormal area and sent to the pathology laboratory.
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Pathology Diagnosis
The pathologist examines the biopsy and reports whether cancer is present and what type it appears to be.
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Surgical Resection Report
If surgery is performed, the removed colon and lymph nodes are examined to provide a more complete pathologic assessment.
Not every patient will have both reports at the same stage of care.
A biopsy may establish the diagnosis before treatment or
surgery, while the more detailed resection report is available
only after tissue has been surgically removed.
Two Different Reports
Colonoscopy Biopsy Versus Surgical Resection
These reports answer different questions. A biopsy can confirm that cancer is present, but it usually cannot provide the same level of detail as examination of the surgically removed tumour and surrounding tissue.
Initial Tissue Sample
Colonoscopy Biopsy Report
A biopsy examines a small portion of the abnormal area. It can often establish the diagnosis and identify the tumour type.
- Whether cancer is present in the sampled tissue
- The tumour's histologic type or pattern
- Grade or differentiation when it can be assessed
- Additional stains used to support the diagnosis
- Mismatch repair testing when performed on the biopsy
After Surgical Removal
Surgical Resection Report
A resection report examines the tumour, bowel wall, surrounding tissue, surgical margins, and regional lymph nodes.
- How far the tumour has grown through the bowel wall
- Whether nearby structures are involved
- How many lymph nodes were examined and involved
- Whether the surgical margins contain tumour
- Tumour deposits and other high-risk features
Inside the Report
What Your Colon Pathology Report May Tell You
A colon pathology report contains several findings that must be understood together. The amount of information available depends on whether the specimen is a small biopsy or a surgical resection.
A pathology finding should not be interpreted in isolation.
Cancer type, depth of invasion, lymph nodes,
margins, tumour deposits, biomarkers, imaging, and
clinical findings may all contribute to the wider
assessment.
Cancer Type
Most colon cancers are adenocarcinomas, although the report may describe a more specific histologic type or growth pattern.
Grade or Differentiation
The report may describe how closely the tumour resembles normal gland-forming tissue. Grade is one part of the overall assessment.
Depth of Invasion
A resection report may show whether the tumour is within the bowel wall, extends into surrounding tissue, reaches the surface, or involves a nearby structure.
Lymph Nodes
The report may state how many lymph nodes were examined and how many contained tumour.
Surgical Margins
The report may describe whether tumour reaches a cut edge or circumferential margin. The meaning depends on the specimen and procedure.
Tumour Deposits
Separate tumour deposits may be present in surrounding tissue without being located inside an identifiable lymph node.
Additional Pathology Features
The report may document lymphovascular invasion, perineural invasion, tumour budding, perforation, or treatment-related changes.
Addenda and Pending Results
Mismatch repair, MSI, molecular testing, or additional stains may appear in a later addendum or separate report.
Personalised Report Support
Need Help Understanding These Findings?
Review the terminology, key findings, limitations, and pending results in your existing colon pathology report during a secure virtual consultation.
Inner lining
Mucosa
Supporting tissue
Submucosa
Muscle layers
Muscularis propria
Surrounding tissue
Pericolonic fat
Outer surface or nearby structure
Where applicable
Depth of Invasion
How Far Has the Tumour Grown Through the Bowel Wall?
Depth of invasion describes how far the tumour extends through the different layers of the colon. This information contributes to the pathologic tumour category, but it is not the complete cancer stage by itself.
Within the Bowel Wall
The report may describe involvement of the inner layers or muscle of the colon wall.
Into Surrounding Tissue
The tumour may extend through the muscle and into the surrounding fatty tissue.
Surface or Nearby Structure
More extensive disease may reach the outer surface or directly involve an adjacent organ or structure.
Additional Pathology Findings
Features That May Contribute to Risk Assessment
Colon resection reports may document additional features that are considered alongside the pathologic stage, molecular findings, imaging, and the wider clinical picture.
Lymphovascular Invasion
This means tumour cells are identified within lymphatic channels or blood vessels. It is separate from finding tumour inside a lymph node.
Perineural Invasion
This describes tumour involving or tracking around nerves. Its significance should be interpreted in the context of the full report.
Tumour Budding
Tumour budding refers to small groups or individual tumour cells at the invasive edge of the cancer.
Tumour Deposits
Tumour deposits are separate tumour foci in the surrounding tissue and are classified separately from identifiable lymph-node involvement.
Obstruction, Perforation and Other Clinical Findings
Some risk-related information may come from the operative report, imaging, or wider clinical record rather than from microscopic examination alone. Your care team combines these findings with the pathology report.
Biomarker Testing
MMR, MSI and Molecular Testing
These tests are often discussed together, but they may answer different questions and may appear in different pathology reports, addenda, or molecular-testing documents.
Mismatch Repair Proteins
Immunohistochemistry may examine whether the mismatch repair proteins are retained or lost within the tumour cells.
MLH1
PMS2
MSH2
MSH6
Microsatellite Instability
MSI testing is another way of assessing mismatch repair function. Abnormal results may affect treatment discussions and may lead the care team to consider further inherited-risk assessment.
Selected Molecular Testing
KRAS, NRAS, and BRAF results may appear in a molecular report or addendum. Their relevance depends on the clinical setting and the wider treatment discussion.
KRAS
NRAS
BRAF
An abnormal tumour result does not by itself confirm an inherited condition.
Further evaluation for conditions such as Lynch syndrome may
be considered by the treating team based on the tumour
findings, personal history, family history, and any additional
testing.
Biomarker Guidance
Questions About MMR, MSI or Molecular Results?
Get a patient-friendly explanation of the biomarker findings already documented in your pathology report and understand which results may still be pending.
Putting the Results Together
What Is Confirmed, Pending or Dependent on Other Tests?
A pathology report may answer many important questions, but it may not provide the complete picture on its own.
Confirmed in the Report
Documented Pathology Findings
The diagnosis, tumour type, grade, depth of invasion, lymph-node findings, margins, and additional microscopic features may be documented when the available specimen allows.
May Still Be Pending
Addenda or Additional Testing
Mismatch repair studies, MSI testing, molecular results, additional stains, or outside-slide review may still be in progress after the first report is issued.
Requires Wider Context
Complete Stage and Treatment Planning
Complete staging and treatment decisions may also require imaging, evidence of distant disease, operative findings, laboratory results, and assessment by the treating care team.
How HONEST Pathology Helps
A Clearer Explanation of the Report You Already Have
A pathology report consultation helps you understand the terminology and findings already documented, so you can approach conversations with your treating team with greater context and more focused questions.
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Upload Your Report and Records
Submit the pathology report and relevant records requested for the consultation.
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Meet Online With a Pathologist
Discuss the report during a private virtual appointment and ask questions about the documented findings.
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Receive a Plain-Language Explanation
Better understand the terminology and prepare questions to discuss with your treating care team.
Consultation Scope
What the Consultation Includes and Excludes
A report explanation and a formal microscopic second opinion are different services. Setting clear boundaries helps you choose the most appropriate option.
The Consultation May Explain
- The final diagnosis and histologic terminology
- Differences between the biopsy and resection reports
- Depth of invasion and pathologic tumour category
- Lymph-node counts, tumour deposits, and margins
- Lymphovascular invasion, perineural invasion, and tumour budding
- MMR, MSI, and molecular results already documented
- Findings that remain pending, limited, or unclear
The Consultation Does Not Include
- A new pathology diagnosis based only on explaining the written report
- Complete staging from the pathology report alone
- Treatment prescribing or replacement of the oncology team
- A physical examination or complete clinical assessment
- Microscopic slide review unless a separate pathology second-opinion service is ordered
Choosing the Right Service
Report Consultation or Second Opinion?
The right option depends on whether you need help understanding the written results or an independent review of the pathology slides and tissue.
Frequently Asked Questions
Questions About Colon Pathology Reports
These answers provide general educational information. Individual reports vary according to the specimen, procedure, testing, and wider clinical situation.
What can a colonoscopy biopsy confirm about colon cancer?
A colonoscopy biopsy can usually determine whether cancer is present in the sampled tissue and may identify the tumour type and grade. Because the biopsy contains only a small amount of tissue, it usually cannot show the complete depth of invasion, all surgical margins, or the full lymph-node findings.
Why does my surgical pathology report contain more detail than my biopsy?
A surgical resection provides the pathologist with the tumour, bowel wall, surrounding tissue, surgical margins, and regional lymph nodes. This allows a more complete assessment than a small biopsy sample.
Does the pathology report show the complete cancer stage?
A surgical pathology report may provide the pathologic tumour and lymph-node categories, but complete staging may also depend on imaging, evidence of distant spread, operative findings, and other clinical information.
What do positive lymph nodes and tumour deposits mean?
A positive lymph node contains tumour within an identifiable lymph node. Tumour deposits are separate tumour foci in surrounding tissue without an identifiable lymph-node structure. They are related findings but are documented and classified separately.
What is the difference between lymphovascular and perineural invasion?
Lymphovascular invasion means tumour cells are identified within lymphatic channels or blood vessels. Perineural invasion describes tumour involving or tracking around nerves. Neither term is the same as finding tumour in a lymph node.
What do intact or deficient mismatch repair proteins mean?
Mismatch repair immunohistochemistry evaluates proteins involved in repairing DNA. The report may describe the proteins as retained or intact, or show loss or deficiency of one or more proteins. Abnormal tumour findings may lead the treating team to consider additional testing, but they do not by themselves confirm an inherited condition.
Can my report be explained without reviewing the pathology slides?
Yes. A report consultation can explain the written diagnosis, terminology, depth of invasion, lymph nodes, margins, high-risk features, biomarkers, and pending findings. It does not provide an independent microscopic diagnosis unless a separate slide-review service is ordered.
When is a second opinion more appropriate?
A second opinion may be more appropriate when the diagnosis is complex, uncertain, unexpected, or when an independent review of the original slides or tissue could provide additional value.
Clearer Answers Begin Here
Understand the Findings in Your Colon Pathology Report
Meet online with a pathologist who can explain the terminology, key findings, biomarker results, and questions raised by your existing report.
Educational support only. This consultation does not replace diagnosis, complete staging, or treatment planning by your treating clinicians.
