CION Ameerpet
Extranodal Lymphoma · Radiation Therapy
Radiation for Lymphoma in Unusual Sites — Stomach, Orbit, Skin and Testis
Most lymphoma pages describe treatment to lymph nodes. This one is about the presentations nobody writes for: lymphoma that starts in the stomach wall, behind the eye, in the skin or in a testis. The radiation is delivered by the same machines, but the dose, the field and the organs that have to be protected are different at every one of these sites — and so are the effects you will live with afterwards.
Medically reviewed by Dr. Kirti Ranjan Mohanty, Radiation Oncologist, MBBS · MD (Radiation Oncology), Senior Consultant · Last reviewed August 2026
- The organ is the field — Treatment is drawn tightly around the stomach, the orbit, a patch of skin or a testis — not around a whole region of the body.
- Doses at these sites are low — For many slow-growing extranodal lymphomas the total dose is well below what a solid tumour needs, so courses are short.
- Each site has its own trade-off — Cataract and dry eye for the orbit. Reflux for the stomach. Fertility for the testis. Thyroid function for the neck.
- Late effects are the young survivor question — Follow-up runs for decades, so what gets checked and how often should be written down before you finish treatment.
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The direct answer
Which Sites Are Treated When Lymphoma Starts Outside the Lymph Nodes?
Whichever organ the disease actually sits in. The stomach is the most common. The orbit, the skin and the testis come next. Salivary gland, thyroid, sinuses, tonsil region, breast, bone and lung are treated less often. The field covers that one organ, not a whole region of the body.
Extranodal means the lymphoma began somewhere other than a lymph node. That single word changes the whole radiation conversation. A nodal plan treats a chain of nodes in the neck, the chest or the abdomen. An extranodal plan treats a stomach wall, the space behind an eye, a patch of skin on the forearm, or one testis. The target is an organ with a job to do, and the plan is judged as much by what it protects as by what it treats.
These presentations are individually rare, which is why almost nothing useful is written for the people living through them. Search for radiation to the orbit and you find surgical pages, ophthalmology pages, and very little that answers what a course actually involves. The clinical reality is more reassuring than that silence suggests. For many of these sites the disease is slow-growing, localised, and treated with a short, low-dose course intended to clear it from that organ.
Radiation is not automatic at any of these sites. For stomach lymphoma linked to a common stomach bacterium, treatment aimed at clearing that infection comes first, and radiation is held for people in whom it does not work or does not apply. For some skin lymphomas, watching is a legitimate first step. For a testis, surgery to remove the affected one usually comes first and radiation is then directed at the remaining testis, at nearby nodes, or both. Where radiation sits in the sequence is a decision, not a default.
Most common
Stomach
Usually a slow-growing marginal-zone lymphoma. Treated when infection-directed treatment is not appropriate or has not cleared the disease. The field covers the stomach and has to account for your breathing.
Eye socket
Orbit, eyelid and tear gland
A short, low-dose course planned around the lens, the tear gland and the optic nerve. Preserving vision is an explicit goal of the plan, not a hoped-for side benefit.
Skin
Skin lymphoma
Treated with low-energy beams that stop in the skin and spare what lies beneath. A single patch, several patches or a wider surface can be treated, sometimes in only a few sessions.
Fertility conversation first
Testis
The affected testis is usually removed surgically first. Radiation is then aimed at the remaining testis, at nearby nodes, or both. Sperm banking has to be arranged before the first session.
Head and neck
Salivary gland and thyroid
Fields here are small, but they sit beside salivary tissue and the thyroid. Dry mouth and an underactive thyroid are the two effects to build follow-up around from the start.
Less common
Sinuses, tonsil region, breast, bone and lung
All treated with radiation in defined situations. Each brings its own set of nearby structures, and each is planned individually rather than from a standard template.
Your radiotherapy is delivered at an NABH-accredited partner centre; CION Cancer Clinics coordinates your treatment plan, your oncology team and your care throughout. CION does not own or operate the treatment machines itself.
Did you know?
The stomach is the single most common extranodal site for lymphoma, and both NCCN and ESMO guidance treat radiotherapy as a standard option for localised gastric marginal-zone disease where infection-directed treatment is not appropriate or has not worked — at total doses considerably lower than those used for solid tumours of the same organ. Guidance position as of August 2026.
The question everyone asks second
Is Radiation Different When the Target Is an Organ Rather Than a Node?
Yes, but the planning is what differs, not the machine. Doses for slow-growing extranodal disease are low, so courses are short. Every organ brings its own movement problem and its own structures to protect. A stomach field is built around breathing and meals. An orbital field is built around the lens.
| Site | What the field covers | What makes planning different | Structures protected in the plan |
|---|---|---|---|
| Stomach | The whole stomach, with a margin | The stomach moves with each breath and changes shape with food, so you are usually asked to attend with an empty stomach and breathing motion is accounted for in the plan | Kidneys, liver, spinal cord, small bowel and heart |
| Orbit and eyelid | The affected part of the orbit, or the eyelid alone | Millimetres matter. Beam entry is chosen so the lens sits outside the high-dose region wherever the disease pattern allows | Lens, tear gland, cornea, retina, optic nerve and the other eye |
| Skin | The visible patch or plaque, with a margin | Low-energy beams are used so the dose stops in the skin. Curved surfaces need shaping so the dose stays even across the whole area | Everything beneath the skin, which receives very little dose |
| Testis | The remaining testis, nearby nodes, or both | Fertility and hormone effects are near-certain, so that conversation has to happen before planning, not after it | Bowel and bladder; the treated testis itself cannot be spared |
| Salivary gland or thyroid | The affected gland | Small fields, but the surrounding tissue governs long-term quality of life, so sparing is prioritised over covering extra margin | Remaining salivary tissue, thyroid, spinal cord and swallowing muscles |
| Sinuses and tonsil region | The involved cavity or ring of tissue | The target sits among many critical structures in a small space, so a mask and image guidance are used at every session | Optic nerves, brainstem, inner ears and salivary tissue |
Doses and techniques differ between centres and between subtypes, and not every approach is available everywhere. Ask your radiation oncologist which structures your plan protects and what dose limit was set for each. It is a fair question, and the answer is already written into your plan.
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A Rare Site Deserves a Plan Built for It
Talk to a radiation oncologist about the dose, the field and the structures being protected before you agree to treatment.
The trade-off, stated plainly
What Are the Effects, in the First Weeks and Decades Later?
Almost every effect belongs to the organ that was treated. Stomach fields bring nausea, and later reflux. Orbital fields bring a dry eye, and later cataract. Neck fields can slow the thyroid. Testicular treatment affects fertility. Fatigue is the one effect common to all of them.
It helps to split this into two questions that usually get asked as one. The first is what the next few weeks feel like. The answer is generally milder than people expect, because the doses used for slow-growing extranodal lymphoma are low. Tiredness that builds through the course, some irritation of whatever tissue is in the beam, and a return towards normal within a few weeks of the last session is the usual pattern.
The second question is the one this page is really for. If you are treated in your twenties or thirties, you are not asking about six weeks. You are asking what a beam through your stomach, your eye socket or your pelvis means when you are sixty. Late effects are organ-specific, they emerge slowly, and most of them are manageable if somebody is actually looking for them. That last clause is the part that fails most often.
Guidance bodies are deliberately careful with numbers here. NCCN and ASTRO survivorship guidance describe the risk of a second cancer arising within a previously treated area as small but real, and as something that accumulates over decades rather than years, which is why surveillance is lifelong rather than time-limited. They do not attach a single figure to it, because it depends on the dose, the size of the field, the age at treatment and what other treatment was given. Be wary of any page that offers you one number. Ask instead what your own field and dose were, and what that means for the checks you need.
- Ask for the treated site in writing. The organ, the dose and the number of sessions. Every doctor you meet over the next thirty years will need this, and memory is not a reliable record.
- Ask which yearly checks belong to your field. A thyroid blood test after a neck field. An eye examination after an orbital field. Hormone levels after testicular treatment.
- Arrange fertility preservation before the first session. This applies to any pelvic or testicular field, and it cannot be done afterwards.
- Report a new lump or a persistent change inside the treated area. Not because it is likely to be serious, but because that is exactly where surveillance is aimed.
- Keep the follow-up going past the five-year mark. The late effects that matter to a young survivor mostly arrive after routine oncology follow-up has ended.
Late-effect risk varies widely with dose, field size, technique and age at treatment, and modern conformal planning spares far more healthy tissue than the wide fields used decades ago. Ask what your own plan involved rather than assuming an older estimate applies to you.
Step by step
How Does a Course of Radiation to an Unusual Site Actually Run?
Planning takes about a week. The team confirms the subtype and the stage, a planning scan is taken in the treatment position, the target and the structures to protect are outlined, and the plan is verified on the machine. Treatment then runs on weekdays, often for two weeks or less.
- Confirming the subtype and the site. The biopsy report drives everything that follows. Two lymphomas in the same organ can call for very different doses, so the pathology is reviewed before any field is drawn.
- Staging, so the field can stay local. Scans and, where relevant, a bone marrow test establish that the disease really is confined to one site. A local field only makes sense once that is known.
- The multidisciplinary discussion. A radiation oncologist, a haematologist or medical oncologist, a pathologist and a site specialist agree whether radiation is used, alone or after systemic treatment, and at what dose.
- The fertility and function conversation. Sperm banking, a thyroid baseline, an eye examination or a dental review, depending on the site. These happen before planning starts, because afterwards is too late for several of them.
- Planning scan and immobilisation. A mask for head, neck or orbital fields. Breathing assessment and an empty stomach for gastric fields. A simple set-up for skin fields. You are scanned in exactly the position you will be treated in.
- Contouring, plan build and checks. The radiation oncologist outlines the target and every structure to be protected. A medical physicist builds and optimises the plan, and it is independently verified and measured on the machine before any beam reaches you.
- Daily treatment and weekly review. Sessions run Monday to Friday. Each visit takes about fifteen to twenty minutes, most of it positioning and imaging. You are seen weekly for fatigue, skin, appetite and anything specific to your site.
- After the last session. A response assessment is arranged at a planned interval rather than immediately, because treated tissue takes time to settle. The long-term surveillance schedule for your organ is then set out in writing.
Costs for a short extranodal course vary with the technique, the number of sessions and the partner centre. Any figure you are quoted should be treated as indicative, as of August 2026, and confirmed in writing before treatment starts. Government scheme cover may apply — ask our team to check your eligibility.
Before you agree to the plan
What Should a Young Survivor Ask Before a Rare-Site Plan Is Signed Off?
Six questions, all of them fair, all of them with answers already sitting in your file. If the answers are not clear, that alone is a reason to ask for a second opinion — or call 1800 202 8726 and talk it through with our team.
- What exactly is in the field, and what is being kept out of it? Ask for the list of protected structures and the dose limit set for each one.
- Could a lower dose or fewer sessions achieve the same aim? For slow-growing extranodal disease this is a live clinical question, not a challenge to your team.
- Is radiation needed now, or is observation reasonable first? At some sites and in some subtypes, waiting is an accepted strategy rather than a refusal to treat.
- What does this mean for fertility, and what has to happen before day one? Ask even if children are not on your mind today.
- Who follows me after five years, and for what? Name the person and name the tests. Survivorship gaps open when nobody owns the follow-up.
- Where is this delivered, and who reviews me during the course? You should know the partner centre and the doctor seeing you weekly before you start.
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Common questions
Extranodal lymphoma radiation — questions people ask
Which body sites can be treated with radiation for extranodal lymphoma?
Lymphoma that starts outside the lymph nodes is treated wherever it sits. The stomach is the most common site. The orbit, the eyelid and the tear gland come next, followed by the skin and the testis. Disease in the salivary gland, the thyroid, the sinuses, the tonsil region, the breast, the bone and the lung is also treated with radiation in the right circumstances. The field is drawn around that one organ, not around a whole region of the body. Which sites are irradiated, and whether radiation is used at all, depends on the subtype, the stage and what any systemic treatment has already achieved.
Is radiation for stomach or orbit lymphoma different from radiation to lymph nodes?
Yes, in three practical ways. The total dose used for many slow-growing extranodal lymphomas is markedly lower than the dose used for solid tumours, so the course is short. The organ being treated moves or is delicate, so planning is built around that: a stomach field has to account for breathing and for an organ that changes shape with food, while an orbital field is built around the lens, the tear gland and the optic nerve. And the structures at risk are specific to the site rather than generic. The machine and the technique are the same ones used for nodal disease. The planning problem is not.
What happens to eyesight when the orbit is treated?
Vision is usually preserved, and the plan is designed with that as an explicit goal. During treatment a dry, gritty eye, watering, redness and mild eyelid swelling are common, and most of it settles within weeks of the last session. The late effect discussed most often is cataract, because the lens is sensitive to even modest doses. A cataract is treatable with routine surgery. Dry eye can persist and is managed with drops your team advises. Injury to the optic nerve or the retina is uncommon with modern planning and low doses, and dose limits for those structures are set before any plan is approved. Ask for an eye examination before treatment starts and once a year afterwards.
What are the long-term effects of radiation for extranodal lymphoma?
They depend almost entirely on which organ was in the field. A stomach field can leave reflux and, less often, ulceration or scarring. An orbital field carries the cataract and dry-eye risks above. Neck and thyroid fields can lead to an underactive thyroid, which is common enough that ASTRO and NCCN survivorship guidance recommend a yearly thyroid blood test for anyone whose thyroid was in the beam. Testicular treatment affects fertility. A small rise in the risk of a second cancer within the treated area is recognised across guidance bodies, and it is described as a risk that accumulates slowly over decades rather than as a fixed figure. Guidance position as of August 2026.
Does radiation to the testis affect fertility?
Yes, and it should be assumed rather than hoped against. The dose used to treat a testis stops sperm production in that testis, and scattered dose usually affects the other one as well. Testosterone can also fall over the years that follow, which is why hormone levels are checked during follow-up. Sperm banking before treatment starts is the single most important step, and it has to be arranged before the first session, not after it. If having children matters to you at all, say so at the first consultation, even if you are unsure. The options narrow sharply once treatment has begun.
Where is the radiation given, and who decides the plan for a rare site?
The decision is made by a multidisciplinary team — a radiation oncologist, a haematologist or medical oncologist, a pathologist and a site specialist such as a gastroenterologist or an ophthalmologist — working from the biopsy, the staging scans and the response to any treatment already given. For rare sites this discussion matters more, not less, because published experience is thinner and the field has to be designed from first principles. Your radiotherapy is delivered at an NABH-accredited partner centre; CION Cancer Clinics coordinates your treatment plan, your oncology team and your care throughout. CION does not own or operate the treatment machines itself. Asking for a second opinion before a rare-site plan is agreed is reasonable and common.