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Children & Young Adults · Craniospinal Radiation
Craniospinal Radiation in Children — What Parents Should Expect
Craniospinal radiation treats the brain and the entire spinal canal, usually once a day for about five to six weeks. It is the most demanding radiation course a child can be given. This page goes through it honestly — week by week during treatment, and then year by year afterwards.
Medically reviewed by Dr. Kirti Ranjan Mohanty, Radiation Oncologist, MBBS · MD (Radiation Oncology), Senior Consultant · Last reviewed August 2026
- The course, week by week — what actually changes in week one, week three and week six — and the two to eight weeks after the last session, when tiredness usually deepens before it lifts
- Growth and height, stated plainly — why radiation slows the growth of the vertebrae inside the field, why the youngest children are affected most, and the hormone follow-up that is meant to catch it
- School, learning and the years after — the changes in attention and processing speed that appear over months rather than days, and the baseline assessment worth asking for before treatment starts
- Fertility and lifelong follow-up — the conversation to have at the planning consultation rather than in adolescence, and why survivorship follow-up does not stop after five years
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The direct answer
How Long Is a Course of Craniospinal Radiation in Children?
Craniospinal radiation is usually given once a day, Monday to Friday, for about five to six weeks. Most children receive roughly 25 to 35 sessions. Add one to two weeks before that for the mask, the planning scan and the plan check. Your child’s exact number comes from the treating team.
Craniospinal radiation treats the brain and the whole spinal canal, because the fluid that surrounds them can carry tumour cells along the entire length. That is what makes it the most demanding radiation course a child can be given — and the reason a general description of “radiotherapy” does not prepare a family for it. Here is what the weeks actually look like.
| Stage of the course | What is happening | What parents commonly see | What helps most |
|---|---|---|---|
| Before day one — planning | Mask fitting, a planning scan in the treatment position, then several days while the plan is built and checked | Nothing physical yet. Most of the distress in this week is fear of the mask and of the machine | Ask for play therapy or a mask rehearsal. Ask now whether your child will need daily anaesthesia |
| Week 1 | Treatment starts. Position checks and imaging take longer in the first few sessions | Usually little. Some children are unsettled by the room and the noise rather than by the treatment | Fix one slot time for the whole course. Early slots suit children who need to fast for anaesthesia |
| Week 2 | The routine settles. Blood counts start to be checked regularly | Tiredness begins. Nausea, if it happens, is often earliest here. Appetite may dip | Shorten the day. Move school to part-time now rather than waiting for a crisis |
| Week 3 | Roughly halfway. A mid-course review and repeat imaging are common | Hair thinning in the treated area. Scalp and back skin may look pink or dry. Counts are often at their lowest around here | Ask what the counts are doing and what number triggers a fever call. Plain water-based skin care only, as advised |
| Week 4 | Treatment continues. The spinal field may be adjusted as the plan requires | Tiredness is usually clearly established. Sore throat or difficulty swallowing can appear | Move to softer, higher-energy foods. Ask for a paediatric dietitian rather than waiting for weight loss |
| Weeks 5–6 — the boost | Many plans finish with a smaller boost to the original tumour site instead of the whole neuraxis | Tiredness at its deepest. Many families describe this as the hardest stretch, not the first week | Drop every optional commitment. Protect sleep. Accept help with the siblings |
| 2–8 weeks after the last session | Nothing is being given, but the effects of treatment are still settling | Tiredness often deepens before it lifts. A period of marked sleepiness weeks after brain radiation is recognised and usually passes | Do not plan a full school return for the week after the last session. Report new drowsiness so it can be assessed rather than assumed |
| 3–12 months on | Survivorship follow-up begins — growth, hormones, hearing, thyroid, schooling | Height and puberty tracking, hearing tests, blood tests. Learning changes may surface at school | Get the follow-up schedule in writing before you leave the last session, and keep the treatment summary forever |
Where this happens, and who does what — your child’s radiotherapy is delivered at an NABH-accredited partner centre; CION Cancer Clinics coordinates your treatment plan, your oncology team and your care throughout. The daily sessions, the mask, the anaesthesia and the imaging all happen at that centre. The planning conversation, the follow-up and the questions in between are ours to hold with you.
Each session is short; each day is not — the beam itself runs for a few minutes. Setting a child up in exactly the same position each day, verifying it with imaging, and adding an anaesthetic where one is needed is what makes an hour of it. Plan the day around one appointment, not around fitting the appointment into a normal day.
Gaps in the course matter — if a session is missed for a fever, a low blood count or an accidental meal before anaesthesia, that decision belongs to the radiation oncologist, not to the family. Call and let the team choose between a later slot the same day, a rescheduled session or a change to the plan. Do not decide to skip a day yourself.
Did you know?
Most children having craniospinal radiation are treated lying face down, so the beam can reach the whole spinal canal from behind. Because the brain field and the spine field have to meet somewhere, the join is deliberately moved a small distance every few days through the course — often called feathering the junction — so that no single strip of spinal cord sits at the join for the whole treatment. If your child’s setup or position changes slightly part-way through, this is usually why, and it is planned rather than a problem.
During the course
What Are the Acute Side Effects During Treatment?
The usual ones are tiredness building from week two, hair loss in the treated area, pink or dry skin over the scalp and back, nausea, sore throat, poor appetite and falling blood counts. Blood counts matter more here than in most radiation courses, because the spinal field crosses a large share of a child’s bone marrow.
From week 2
Tiredness that keeps deepening
Not ordinary tiredness. It builds through the course, is usually worst in the last fortnight, and commonly gets worse for two to eight weeks after the final session before it starts to lift. A marked spell of sleepiness some weeks after brain radiation is recognised and usually settles on its own, but it should always be reported rather than assumed.
Blood counts
The effect that is specific to this course
The spine holds a large share of a child’s bone marrow, and the spinal field passes through it. White cells, platelets and haemoglobin can all drop, more so if chemotherapy is running alongside. Counts are checked regularly. Ask your team what number triggers a phone call, and treat any fever as urgent until the team says otherwise.
Skin and hair
Scalp, and a strip down the back
Hair is lost in the treated area, and after craniospinal radiation that includes the scalp. Skin over the scalp and along the spine can turn pink, dry or itchy in the later weeks. Use only what your team advises, wash gently with lukewarm water, and keep the treated skin out of direct sun. Regrowth is often thinner and can take months.
Stomach and throat
Nausea, appetite and swallowing
Nausea is common, particularly early in the course, and the beam passing through the neck and the front of the spine can leave a sore throat or make swallowing uncomfortable by weeks three to five. Anti-sickness medicine is prescribed by the treating team. Move to softer, higher-energy food before weight starts to fall rather than after.
Growth in the moment
Weight, and why it is watched weekly
A child in treatment has less room to lose weight than a well child does, and a daily fast for anaesthesia adds to it. Ask for the weight to be recorded every week and for a paediatric dietitian referral early. Waiting until the end of the course to address a downward drift is the pattern that causes the most trouble.
Mood and behaviour
The part that is not on the side-effect sheet
Daily hospital attendance, a mask, a fast and separation from siblings change a child’s behaviour. Regression in a small child, refusal, clinginess or anger in an older one are common and are not a sign that anything has gone wrong. Ask for play therapy or counselling support at the start of the course, not at the point of crisis.
Call the treating centre straight away, on any day of the course, if your child has a fever, is shivering or looks unwell, has persistent vomiting, a severe or worsening headache, new drowsiness that is hard to rouse, new weakness or numbness in the legs, or any bleeding or unusual bruising. With blood counts falling, a fever is treated as an emergency until the team says otherwise. Do not wait for the next scheduled session. You can also reach our care team on 1800 202 8726, and if your child is seriously unwell, go to the emergency department now.
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Facing Six Weeks of Craniospinal Radiation?
Talk to a radiation oncologist about your child’s course, the anaesthesia question, the school plan and the follow-up that should be arranged before day one.
The decades afterwards
What Are the Long-Term Effects of Craniospinal Radiation?
The effects followed for life are spine growth and adult height, pituitary hormones, attention and school learning, hearing, the thyroid, fertility, the organs in the exit path of the spinal field, and a small increase in second-cancer risk years later. Younger children are affected more.
This is the part parents are least often given in one place, and the part that matters for the next thirty years rather than the next six weeks. None of it is a reason to decline treatment that has been recommended. All of it is a reason to leave the last session with a written follow-up schedule. Open the one you need.
Height and the growth of the spine
Radiation slows the growth of the vertebrae that sit inside the treated field, so the trunk grows less than the arms and legs do. The effect is real, it is not reversible, and it is largest in the children treated youngest and before their growth spurt. Nobody can give you a single figure in centimetres in advance, because it depends on age at treatment, the dose to the spine and how much growing was still to come. What you can ask for is a growth chart kept from the start and reviewed at every follow-up, so a change is picked up while there is still something to do about it.
Growth hormone and the other pituitary hormones
The pituitary gland sits inside the brain field, and hormone deficiency is the commonest long-term effect after radiation to the brain. Growth hormone is usually the first to be affected and can appear anything from months to several years after treatment, which is why a child who seems fine at the first follow-up still needs the later ones. Thyroid hormone, the hormones that drive puberty and, less often, the stress hormone can also be involved. All of this is treatable when it is found, and endocrine follow-up is the reason it gets found. Ask specifically for a paediatric endocrinology referral to be set up rather than assuming it is automatic.
Thinking, attention and school learning
Radiation to the whole brain can affect processing speed, working memory, attention and the ability to learn new material at the same pace as before. It rarely shows up as a dramatic change. It shows up as school work taking longer, as difficulty finishing in exam time, and as a child who understands the lesson but cannot get it down on paper. Younger children are affected more than older ones. The single most useful thing a parent can arrange is a baseline assessment of thinking and learning before or early in treatment, so that a later assessment has something to be compared with rather than being argued about.
Hearing
Hearing loss can follow radiation to the brain, and the risk is higher when a child has also had certain chemotherapy that affects hearing. It usually affects high frequencies first, which is exactly the range a child needs to pick a teacher's voice out of a noisy classroom. A child rarely reports it, because they have no way of knowing what they are missing. Ask for a hearing test before treatment and for repeat tests in the follow-up schedule. If hearing has changed, tell the school, because seating and a classroom hearing device are simple things that change how well a child copes.
The thyroid, and the neck in the exit path
The thyroid gland sits at the front of the neck, directly in the exit path of the upper spinal field, and an underactive thyroid is one of the more common late effects after craniospinal radiation. It develops quietly, often years later, and the early signs are easily mistaken for ordinary tiredness or the after-effects of treatment. A blood test finds it and treatment is straightforward. Ask for thyroid blood tests to be written into the follow-up schedule, and ask that the neck be examined at follow-up visits as well, because thyroid nodules also need to be looked for over the long term.
Fertility, and when to raise it
The lower part of the spinal field runs close to the ovaries in girls, and boys can receive scattered dose towards the testes, with the amount depending on the child's size and the technique used. Hormone changes from the brain part of the treatment can separately affect puberty and fertility. The conversation belongs at the planning consultation, not in adolescence, because some options only exist before treatment starts and depend on the child's age and stage of puberty. Ask for it explicitly. Ask for it again at the survivorship review, because what can be assessed changes as a child grows up.
Heart, lungs, gut and the exit path of the spine field
A beam aimed at the spinal canal from behind carries on through the chest and abdomen in front of it. That is why the heart, the lungs and parts of the gut are included in long-term follow-up after craniospinal radiation, even though they were never the target. It is also the main reason proton treatment is discussed for children where it is available, since it deposits far less dose beyond the target. Whatever technique your child has, ask for the organs in the exit path to be named in the follow-up plan so that later symptoms are investigated against the treatment history rather than in isolation.
Second cancers, and why follow-up does not end
Radiation carries a small increase in the risk of a different cancer developing in or near the treated area many years later. The risk is small in absolute terms, it is higher the younger the child was, and it does not go away after five years, which is precisely why international survivorship guidance recommends lifelong follow-up rather than discharge. This is not a reason to decline treatment that is being recommended. It is a reason to keep the treatment summary safely forever, to make sure the adult doctors who see your child in twenty years know exactly what was given, and to keep the surveillance appointments.
General information for parents of children having craniospinal radiation. It does not replace the plan, the consent discussion or the written instructions from your child’s treating team. Long-term follow-up and late-effect surveillance framed on published paediatric survivorship guidance (Children’s Oncology Group long-term follow-up guidelines; NCCN survivorship guidance). Last reviewed August 2026.
What to do, from week one
What Can I Actually Do as a Parent, Starting Now?
Six things change how the next thirty years go, and all of them are arranged at the start rather than at the end. Ask for them at the planning consultation, in writing, before the first session — not in the week your child finishes treatment.
Ask for a baseline learning assessment
before or early in treatment — without a baseline, later school difficulties are hard to prove and easy to dismiss
Ask for a growth chart from day one
height, weight and sitting height recorded at every visit, so a change in spine growth is picked up early
Ask for a hearing test before treatment
and repeat tests in the follow-up schedule — a child will not report high-frequency loss themselves
Ask for endocrine follow-up to be booked
growth hormone and thyroid problems can appear months or years later, so a single early normal result is not the end of it
Ask for the fertility discussion now
some options only exist before treatment starts, and they depend on your child’s age and stage of puberty
Ask for the follow-up schedule in writing
who reviews what, and how often, for the next decade — then keep the treatment summary permanently
Ask about the technique, and ask early — craniospinal radiation can be delivered with photons or, where it is available, with protons, which deposit much less dose beyond the target and so spare more of the chest and abdomen in front of the spine. Availability, waiting time and travel all come into that decision, and it is a discussion for the planning stage rather than mid-course. Your radiotherapy, whichever technique is chosen, is delivered at an NABH-accredited partner centre; CION Cancer Clinics coordinates your treatment plan, your oncology team and your care throughout.
Ask what it will cost, line by line — a craniospinal course has more moving parts than most: the planning scan, the mask, the sessions themselves, imaging through the course, blood tests, and daily paediatric anaesthesia where it is needed, which is often billed separately rather than inside the radiotherapy package. Any figure quoted to you is indicative, as of August 2026, and it moves with the number of sessions your child actually needs. Ask specifically whether your policy or scheme cover includes the anaesthesia, because that is not automatic even when the radiotherapy itself is covered.
Set up the school conversation in week one — not in the term after treatment. Tell the school what is happening, ask for one named point of contact, and agree in advance what a part-time timetable looks like. Ask for extra time, a reduced writing load and seating near the front to be recorded formally, so it survives a change of class teacher. Learning changes after brain radiation usually appear over months and years, and a school that has been in the conversation from the start responds far better than one told about it later.
Keep the treatment summary forever — the record of exactly what area was treated, at what dose, over how many sessions, and what else was given alongside. In twenty years an adult doctor who has never met your child will need it to know what to screen for. Ask for it at the end of the course, keep a paper copy and a photograph of it, and give a copy to your child when they are old enough to hold their own health record.
Related reading
What Else Should I Read Before the Planning Consultation?
Craniospinal radiation touches growth, schooling, fertility and the decades afterwards. These guides go deeper into the parts most parents come back to, and the hub links to everything else about a radiation course.
Families we have supported
Parents Ask These Questions Before Day One
Growth, schooling, fertility and the decades afterwards are fair questions to raise at the planning consultation. Ask them early rather than at the end of the course.
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Common questions
Craniospinal Radiation in Children — Parents’ Questions Answered
How long is a course of craniospinal radiation in a child?
Craniospinal radiation is usually given once a day, Monday to Friday, for about five to six weeks. Most children receive roughly 25 to 35 sessions, and the last part of the course is often a smaller boost aimed at the original tumour site rather than the whole neuraxis. Add one to two weeks before that for the mask, the planning scan and the plan check, so the whole process from planning visit to last session commonly runs seven to eight weeks. Each daily session takes only a few minutes of beam time, but expect to be at the centre for about an hour, and longer on days your child has a general anaesthetic.
What are the acute side effects of craniospinal radiation in children?
The common ones are tiredness that builds from about the second week, hair loss in the treated area, dry or pink skin over the scalp and along the back, nausea, a sore throat or difficulty swallowing, poor appetite and falling blood counts. Blood counts matter more here than in most other radiation courses, because the spinal field passes through a large share of a child's bone marrow. Most of these settle in the weeks after the last session. Tiredness is the slowest to lift and often deepens for two to eight weeks afterwards before it starts to improve.
What are the long-term effects of craniospinal radiation in children?
The effects followed for life are reduced growth of the spine and final adult height, pituitary hormone problems including growth hormone deficiency, changes in attention, processing speed and school learning, hearing loss, an underactive thyroid, reduced fertility, effects on the heart, lungs and gut that sit in the exit path of the spinal field, and a small increase in the risk of a second cancer years later. How much of this applies to your child depends on their age at treatment, the dose and the technique used, and younger children are affected more. This is why international survivorship guidance recommends a lifelong follow-up schedule rather than discharge after a few years.
Will my child need a general anaesthetic for craniospinal radiation?
It depends on age and on how your child copes with lying still. Children under about three or four almost always need a short daily general anaesthetic, because craniospinal radiation needs the head and the whole spine held in exactly the same position every day. Many children over about five or six can be treated awake after a few play-therapy sessions with the mask and the couch. Some children start under anaesthesia and move to awake treatment part-way through the course. Ask your team at the end of the first week whether that is worth trying for your child, because it removes the daily fast as well as the anaesthetic.
Will craniospinal radiation affect my child's schooling and learning?
Often, yes, and planning for it early works better than reacting to it later. Radiation to the whole brain can slow processing speed, working memory and attention, and these changes usually appear over months and years rather than immediately, which is why they are missed at first. Ask for a baseline assessment of your child's thinking and learning before or early in treatment, so later results can be compared against something real. Ask the school for extra time, a reduced writing load, seating near the front and one named point of contact. Many children do attend school during the course, usually part-time and arranged around the daily slot.
Does craniospinal radiation affect my child's fertility later?
It can, and it belongs in the conversation before treatment starts rather than years afterwards. The spinal field runs close to the ovaries in girls and can deliver scattered dose towards the testes in boys, depending on the child's size and the technique used. Hormone changes from the brain part of the treatment can also affect puberty and fertility. Some children treated this way go on to have children of their own and some do not, and nobody can tell you in advance which group your child is in. Ask for a fertility discussion at the planning consultation, and ask for it again at the survivorship review in adolescence.