This page is general information, not medical advice. Your own doctor or care team is the right source for questions about your skin, diagnosis or treatment.
A report can contain an unfamiliar word in almost every line. Understanding the purpose of its sections makes the document easier to read, but it does not turn a general definition into an interpretation of your case. The diagnosis, the measurements and the clinical context need to be considered together.
A pathology report records the examination of tissue removed during a biopsy or surgery. A pathologist is a doctor trained to identify disease in cells and tissues. The report concerns the specimen examined, rather than every part of the body.
The usual sections
The National Cancer Institute's pathology-report fact sheet describes identifying details, the site where the sample came from, and how it was obtained. The report usually has a gross description, a microscopic description and a diagnosis. Some reports also include comments or details about further tests.
The gross description is what the tissue looks like without a microscope. It may describe its color, size and shape, the body site and the samples received. The microscopic description concerns the cells and structures seen after the tissue is prepared, placed on slides and stained. The diagnosis brings those findings together with relevant clinical information.
The word gross has a technical meaning here: visible to the eye. It is not an assessment of severity. Likewise, the length of a report or the number of unfamiliar terms does not tell a reader what treatment applies. Your care team can identify the findings that matter most to the specific diagnosis.
The NCI describes comments as a place for unusual features, alternative possibilities, relevant history or tests still in progress. Additional molecular findings may appear in separate reports linked to the main report. A pending item means more information is being obtained, and the team can explain what question that information addresses.
Thickness and ulceration
The American Cancer Society's melanoma staging explanation describes Breslow thickness as a measurement of how deeply melanoma has grown into the skin. This is different from the visible width of a spot. Depth is part of the primary tumor information used in staging.
Ulceration describes breakdown of the skin surface over the melanoma. It is assessed as part of the tissue findings. It is not a term for every symptom someone might notice at the site. A care team can explain whether it was identified and how it contributed to the stage description.
A thickness diagram shows the direction of the measurement into the skin. It cannot represent the depth or shape of a particular person's tumor. The report and the clinical team supply that information. The terms epidermis and dermis refer to the outer skin layer and the layer beneath it.
Terms in context
The definitions below summarize the NCI report description and the American Cancer Society's staging explanation. They explain vocabulary, without assigning a meaning to any reader's result. Some terms describe the sample itself; others contribute to staging or describe how a diagnosis was reached.
| Term | Plain meaning |
|---|---|
| Specimen | The tissue or cells sent for examination, with details about where they came from. |
| Gross description | The appearance and characteristics of the sample seen without a microscope. |
| Microscopic description | What the pathologist sees in prepared tissue under the microscope. |
| Breslow thickness | How deeply the melanoma extends into the skin. |
| Ulceration | A break in the surface over the melanoma. |
| Margin | The edge of the tissue removed during the procedure. |
| Negative margin | No cancer cells were seen at that tissue edge. |
| Positive margin | Cancer cells were seen at that tissue edge. |
| Lymph node finding | Whether cancer cells were identified in an examined node. |
| TNM | Information about the primary tumor, nearby lymph nodes and distant spread, combined for staging. |
Margins, lymph nodes and the stage
The NCI explains that normal tissue around a removed tumor may also be examined. Its edge is the margin. Negative and positive describe whether cancer cells are seen at that edge. These terms refer to the examined sample; the care team explains their significance alongside the procedure and other findings.
Lymph nodes are small structures containing immune cells. When nodes are removed for examination, a report can record whether cancer cells were seen. The page on sentinel lymph node biopsy explains why a first draining node may be sampled.
The American Cancer Society distinguishes clinical staging, based on examination, biopsy and imaging, from pathological staging that may include findings from further surgery. Those descriptions can differ when additional tissue provides information that was not previously available. A report alone may therefore be part of a staging assessment rather than the whole assessment. The page on early-stage melanoma explains the general staging language.
What research says about agreement and review
A study of diagnostic agreement published in BMJ examined how pathologists classified melanocytic skin lesions, meaning growths involving pigment-producing cells. Agreement varied by diagnostic category. The study found lower reproducibility and accuracy in categories spanning moderately atypical moles through early invasive melanoma than in some other categories. This was a study of selected cases and classifications; it does not establish that a particular report is mistaken.
A UK study published in the Journal of Clinical Pathology examined cases reviewed by a specialist skin-cancer team. Differences in tissue assessments sometimes changed the stage or clinical management, while agreement on the final diagnosis was high. The authors concluded that disagreements could have important implications for a small number of patients. That finding concerns the study's reviewed cases, rather than a guaranteed benefit from another review.
The NCI describes second pathology opinions as a review of slides or tissue blocks by another pathologist. This differs from a second opinion about the full care plan, although both may form part of the same discussion. The explanation of second opinions and shared decisions covers that distinction. Your team can explain whether any uncertainty exists in your own report and what, if anything, remains to be clarified.