[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [General pathology](https://durgical.com/en/general-pathology/) › [Neoplasia](https://durgical.com/en/general-pathology/#a-neoplasia) › Benign vs malignant tumours: the comparison table

[General pathology](https://durgical.com/en/general-pathology/) · [Neoplasia](https://durgical.com/en/general-pathology/#a-neoplasia)

# Benign vs malignant tumours: the comparison table

- Topic

Benign tumours stay put and look like their tissue; malignant ones invade, spread and look abnormal. Metastasis settles the question.

Updated 2026-11-01

## Key points

- Four criteria: differentiation/anaplasia, growth rate, local invasion, metastasis.
- Metastasis is the single definitive sign of malignancy.
- Benign tumours are often encapsulated and push tissue aside; malignant tumours infiltrate it.
- Exceptions: basal cell carcinoma invades locally but rarely metastasises; most gliomas rarely spread outside the central nervous system.
- A benign tumour can still kill by its location (meningioma) or its hormone (pheochromocytoma, insulinoma).

## What it is

The pathologist separates benign from malignant tumours with four criteria: differentiation, rate of growth, local invasion and metastasis. Only metastasis proves malignancy without doubt; invasion is the next most reliable sign. The distinction drives everything that follows: surgery margins, staging and prognosis.

## Key facts

- Some tumours sit in between: borderline tumours or tumours of low malignant potential (for example some ovarian epithelial tumours).
- A capsule is a good sign but not proof: some malignant tumours grow with a pseudocapsule of compressed tissue.
- Benign tumours of endocrine glands can secrete hormones and cause disease out of proportion to their size.

## Benign or malignant: what to look for

| Feature | Benign | Malignant |
| --- | --- | --- |
| Differentiation | Well differentiated; resembles the tissue of origin | From well differentiated to anaplastic |
| Nuclei and mitoses | Uniform nuclei; few, normal mitoses | Pleomorphic, dark nuclei; many and atypical mitoses |
| Growth | Usually slow; may stop or regress | Usually faster and erratic; necrosis when it outgrows its blood supply |
| Border | Well demarcated, often with a fibrous capsule | Poorly demarcated; infiltrates and destroys |
| Local invasion | Absent | Present (crosses the basement membrane, nerves, vessels) |
| Metastasis | Never | Frequent; more likely with larger, less differentiated tumours |
| Recurrence after excision | Rare when fully removed | Common if margins are not clear |

## Clinical notes

- Uterine fibroids (leiomyomas) are very common and benign; leiomyosarcoma usually arises on its own rather than from a fibroid.
- Among benign liver masses, haemangioma is the most common; hepatocellular adenoma matters because it can bleed and, rarely, become malignant.
- A colorectal adenoma is benign but is the precursor of most colorectal cancers, which is why polyps are removed at colonoscopy.
- Fibroadenoma of the breast is a benign, mobile, well-circumscribed mass typical of young women.

## Memory aid

Benign is a polite guest who stays in its room (capsule); malignant breaks the walls (invasion) and moves to other houses (metastasis).

## Test yourself

Think of the answer, then tap the question to see it.

## Which single feature proves that a tumour is malignant?

Metastasis: a deposit of the tumour at a site discontinuous with the primary.

## Which malignant tumour invades locally but rarely metastasises?

Basal cell carcinoma of the skin (gliomas behave similarly inside the brain).

## How can a benign tumour be lethal?

By its location (a meningioma compressing the brain, a cardiac myxoma blocking a valve) or by secreting hormones (pheochromocytoma, insulinoma).

## Why is a fibrous capsule typical of benign tumours?

Slow, expansile growth compresses the surrounding stroma into a rim, so the tumour pushes tissue aside instead of infiltrating it.

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## Related

- [Naming tumours: -oma, carcinoma, sarcoma, and the misleading names](https://durgical.com/en/general-pathology/naming-tumours-oma-carcinoma-sarcoma-and-the-misleading-names/)
- [Differentiation and anaplasia: how a tumour cell looks under the microscope](https://durgical.com/en/general-pathology/differentiation-and-anaplasia-how-a-tumour-cell-looks-under-the-microscope/)
- [Invasion and metastasis: the metastatic cascade, step by step](https://durgical.com/en/general-pathology/invasion-and-metastasis-the-metastatic-cascade-step-by-step/)
- [Pathways of spread and the usual metastatic sites](https://durgical.com/en/general-pathology/pathways-of-spread-and-the-usual-metastatic-sites/)
- [Grading and staging: what TNM means](https://durgical.com/en/general-pathology/grading-and-staging-what-tnm-means/)

## Related conditions

- [Uterine fibroids (leiomyomas)](https://durgical.com/en/conditions/uterine-fibroids/)
- [Benign liver lesions (haemangioma, focal nodular hyperplasia, adenoma)](https://durgical.com/en/conditions/benign-liver-lesions/)
- [Colorectal cancer](https://durgical.com/en/conditions/colorectal-cancer/)
- [Colorectal polyps and hereditary polyposis syndromes (FAP, Lynch)](https://durgical.com/en/conditions/colorectal-polyps-and-hereditary-polyposis-syndromes/)
- [Breast fibroadenoma](https://durgical.com/en/conditions/breast-fibroadenoma/)
- [Meningioma](https://durgical.com/en/conditions/meningioma/)
- [Cardiac tumours (atrial myxoma)](https://durgical.com/en/conditions/cardiac-tumours/)
- [Phaeochromocytoma](https://durgical.com/en/conditions/phaeochromocytoma/)
- [Basal cell carcinoma](https://durgical.com/en/conditions/basal-cell-carcinoma/)
- [Pituitary adenoma](https://durgical.com/en/conditions/pituitary-adenoma/)
- [Breast cancer](https://durgical.com/en/conditions/breast-cancer/)
- [Glioblastoma](https://durgical.com/en/conditions/glioblastoma/)

## Elsewhere in DurgiPedia

- [Basement membrane](https://durgical.com/en/histology/basement-membrane/)

[← All of general pathology](https://durgical.com/en/general-pathology/)

Educational content on the mechanisms of disease; not a diagnostic or treatment guide and no substitute for a health professional's advice. No doses are given.

Sources: [What Is Cancer?](https://www.cancer.gov/about-cancer/understanding/what-is-cancer) (National Cancer Institute (NCI), 2026); [Tumor List | SEER Training](https://training.seer.cancer.gov/disease/categories/tumors.html) (SEER Training Modules, National Cancer Institute, 2026); [Tumor Grade](https://www.cancer.gov/about-cancer/diagnosis-staging/diagnosis/tumor-grade) (National Cancer Institute (NCI), 2026).

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License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/general-pathology/benign-vs-malignant-tumours-the-comparison-table/