# Nodal and extranodal lymphoma

Source: https://onco.cc/terms/lymphoma-nodal-versus-extranodal/  
OnCo record `lymphoma-nodal-versus-extranodal` (Term). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

A lymphoma that starts in a lymph node is called nodal; one that starts in an organ is called extranodal. A substantial minority of non-Hodgkin lymphomas start outside the lymph nodes, and where it started often changes the cause, the treatment and the outlook more than the cell type does.

## Summary

Lymphoid tissue is not confined to lymph nodes. It lines the gut, the airways, the salivary glands and the thyroid, and it accumulates wherever there is long-standing inflammation. A lymphoma arising in one of those places is a primary extranodal lymphoma, and the site is part of the diagnosis.

Four ways the site changes the disease:

It names the cause. Gastric marginal zone lymphoma follows Helicobacter pylori infection; lymphoma of the salivary gland follows Sjogren syndrome; lymphoma of the thyroid follows Hashimoto thyroiditis; enteropathy-associated T-cell lymphoma follows coeliac disease. Removing the cause can be the treatment: eradicating Helicobacter pylori puts most early gastric MALT lymphomas into lasting remission without any cancer treatment at all.

It changes the first treatment. Early extranodal marginal zone lymphoma of the orbit is treated with radiotherapy to a small field, or with an antibiotic; the same cells in a lymph node are not.

It creates sanctuaries. The brain, the vitreous and the retina, and the testis are immune-privileged: the immune system does not patrol them and most drugs do not reach them. WHO-HAEM5 grouped large B-cell lymphomas at those three sites into one entity in 2022 because they share a mutational profile and a habit of relapsing in each other. A lymphoma of the testis needs the other testis irradiated and the brain protected, or it comes back in one or the other.

It changes the emergencies. Lymphoma of the small bowel can perforate; lymphoma of the chest can obstruct the superior vena cava; lymphoma of the spine can compress the cord. Those are presentations of the site, not of the cell type.

The staging system counts extranodal disease twice over: the suffix E marks a single extranodal site reached by direct extension, stage IV marks diffuse involvement of an organ, and the number of extranodal sites is one of the five items in the International Prognostic Index.

## Fields

- Kind: Term
- Last checked: 2026-09-29
- Also known as: nodal lymphoma; extranodal lymphoma; primary extranodal lymphoma; extranodal site
- Tags: heme; lymphoma

## Sources

- WHO Classification of Haematolymphoid Tumours, 5th edition: lymphoid neoplasms (Alaggio, Leukemia 2022): https://doi.org/10.1038/s41375-022-01620-2
- Lugano classification: recommendations for initial evaluation, staging and response assessment of Hodgkin and non-Hodgkin lymphoma (Cheson, J Clin Oncol 2014): https://doi.org/10.1200/JCO.2013.54.8800
- NCI PDQ: adult non-Hodgkin lymphoma treatment (health professional version): https://www.cancer.gov/types/lymphoma/hp/adult-nhl-treatment-pdq

## Connected records

- terms: [International Prognostic Index (IPI)](https://onco.cc/terms/ipi-score/), [Lugano classification / Ann Arbor staging](https://onco.cc/terms/lugano-classification/), [Lymphoma (tissue type)](https://onco.cc/terms/lymphoma-type/), [Staging a lymphoma of the stomach or bowel](https://onco.cc/terms/lymphoma-lugano-gastrointestinal/)
- cancers: [Breast implant-associated anaplastic large cell lymphoma](https://onco.cc/cancers/breast-implant-associated-alcl/), [Cutaneous T-cell lymphoma (mycosis fungoides and Sezary syndrome)](https://onco.cc/cancers/cutaneous-t-cell-lymphoma/), [Enteropathy-associated T-cell lymphoma](https://onco.cc/cancers/enteropathy-associated-t-cell-lymphoma/), [Extranodal marginal zone lymphoma of mucosa-associated lymphoid tissue (MALT lymphoma)](https://onco.cc/cancers/malt-lymphoma/), [Extranodal NK/T-cell lymphoma](https://onco.cc/cancers/extranodal-nk-t-cell-lymphoma/), [Gastric MALT lymphoma](https://onco.cc/cancers/gastric-malt-lymphoma/), [Lymphomatoid papulosis](https://onco.cc/cancers/lymphomatoid-papulosis/), [Marginal zone lymphoma](https://onco.cc/cancers/marginal-zone-lymphoma/), [Monomorphic epitheliotropic intestinal T-cell lymphoma](https://onco.cc/cancers/monomorphic-epitheliotropic-intestinal-t-cell-lymphoma/), [Mycosis fungoides](https://onco.cc/cancers/mycosis-fungoides/), [Non-Hodgkin lymphoma (all types)](https://onco.cc/cancers/non-hodgkin-lymphoma/), [Ocular adnexal MALT lymphoma](https://onco.cc/cancers/ocular-adnexal-malt-lymphoma/), [Plasmablastic lymphoma](https://onco.cc/cancers/plasmablastic-lymphoma/), [Primary CNS lymphoma](https://onco.cc/cancers/primary-cns-lymphoma/), [Primary cutaneous anaplastic large cell lymphoma](https://onco.cc/cancers/primary-cutaneous-anaplastic-large-cell-lymphoma/), [Primary effusion lymphoma](https://onco.cc/cancers/primary-effusion-lymphoma/), [Primary large B-cell lymphoma of the testis](https://onco.cc/cancers/primary-testicular-lymphoma/)

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