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Childhood Cancer Types — Parent’s Guide
Childhood bone cancer — osteosarcoma and Ewing sarcoma, explained
Medically reviewed by Dr. Muralidhar Muddusetty, MS (Surgical Oncology) · Last reviewed June 2026
If your child or teenager has been diagnosed with bone cancer — or if a scan or X-ray has raised concern about a bone tumour — you deserve a clear, honest explanation without delay. Bone cancer in children most often means one of two distinct tumour types: osteosarcoma or Ewing sarcoma. Both are serious, both are treatable at specialist centres, and both require a carefully planned, team-based approach from the very first biopsy onwards. This page explains what each tumour is, the warning signs every parent should recognise, how diagnosis works, and what the treatment journey looks like step by step.
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Understanding childhood bone tumours
Types of bone cancer in children — what every parent should know
Bone cancer in children is not a single disease. The two most common primary bone tumours in children and teenagers are osteosarcoma and Ewing sarcoma — and they are biologically different, behave differently, and require different treatment approaches. Understanding which type your child has is the essential first step.
Most common bone cancer in children
Osteosarcoma
Osteosarcoma is the most common primary bone cancer in children and teenagers. It arises from osteoblasts — the cells whose job is to produce new bone tissue. Because osteoblasts are most active during periods of rapid bone growth, osteosarcoma most often appears during the adolescent growth spurt. The tumour typically forms in the long bones of the limbs, most commonly around the knee (the lower end of the thigh bone or the upper end of the shin bone) and in the upper arm bone near the shoulder. Osteosarcoma tends to be high-grade, meaning it grows and spreads relatively quickly, which is why prompt diagnosis and specialist referral matter.
- Peak age 10 to 20 years; slightly more common in boys
- Most common location: around the knee or upper arm
- X-ray often shows a mixed pattern of bone destruction and abnormal new bone
- Treatment combines chemotherapy before and after surgery
Second most common — any bone or soft tissue
Ewing Sarcoma
Ewing sarcoma is the second most common childhood bone tumour. It can arise in any bone, but it more commonly affects the flat bones of the body — the pelvis, ribs, shoulder blades, and vertebrae — as well as the mid-shaft of long bones, in contrast to osteosarcoma’s preference for the ends of long bones near growth plates. Ewing sarcoma can also grow in soft tissue without involving bone at all, and this soft-tissue form is sometimes called extraskeletal Ewing sarcoma. At a molecular level, most Ewing sarcomas carry a specific chromosomal rearrangement that can be detected by laboratory testing — and this is one of the key ways it is distinguished from osteosarcoma when the biopsy results are reviewed.
- Can affect children of all ages; peak in mid-teenage years
- Fever and swelling are common presenting features
- Often involves pelvis, ribs, or the shaft (not end) of long bones
- Treatment includes chemotherapy, surgery, and sometimes radiation
Important context for parents
Benign Bone Tumours vs Bone Cancer
Not every bone tumour in a child is cancer. Many children and teenagers develop benign (non-cancerous) bone lesions that are found incidentally on X-rays taken for other reasons — such as after a minor injury. Common benign lesions include simple bone cysts, fibrous dysplasia, non-ossifying fibromas, and osteochondromas. These lesions do not spread and most do not require treatment. However, some benign tumours can cause pain, risk fracture, or have features that require monitoring. A specialist bone tumour review is needed to correctly classify any bone lesion found on imaging and to avoid unnecessary alarm — or unnecessary delay when treatment is genuinely needed.
- Most bone lesions found on X-ray in children are benign
- Benign lesions do not spread and often need no treatment
- A specialist review distinguishes benign from malignant accurately
- Do not rely on a general X-ray alone to rule out concern
Less common
Other Rare Bone Tumours in Children
Beyond osteosarcoma and Ewing sarcoma, a small number of children develop other rarer bone tumours. These include chondrosarcoma (arising from cartilage cells, which is unusual in children and more common in adults), chordoma (a rare tumour of the skull base or sacrum arising from remnants of the embryonic spine), and undifferentiated pleomorphic sarcoma (UPS) of bone. Each of these has its own biology and treatment approach. Any unusual bone tumour in a child should be reviewed by a multidisciplinary team with experience in paediatric bone tumours, because management decisions depend on the exact tumour type and cannot be made on the basis of imaging alone.
- Chondrosarcoma, chordoma, and UPS are rare in children
- Specialist pathology review is always required for accurate diagnosis
- Treatment varies significantly depending on the exact tumour type
Bone tumours are one of several cancer types that affect children. For a broader overview of all childhood cancers and what to look for, visit the Pediatric Cancer hub. To understand how childhood cancer is investigated through imaging, see our childhood cancer scans and imaging page.
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Every child referred to CION with a suspected bone tumour is reviewed at a multidisciplinary tumor board — medical, surgical, and radiation oncologists together. No rushed decisions. We walk this journey with you, step by step.
From first concern to recovery
How childhood bone cancer is diagnosed and treated — step by step
The path from a worrying X-ray to a completed treatment plan follows a structured sequence. Understanding each step helps parents know what to expect, what questions to ask at each stage, and why certain steps cannot be skipped or hurried.
First imaging — the X-ray that raises concern
Most bone tumours in children first come to attention through a plain X-ray, often taken after a child presents with persistent limb pain or a visible swelling. Osteosarcoma can produce a characteristic “sunburst” appearance or show aggressive new bone formation mixed with bone destruction on X-ray. Ewing sarcoma may show “onion-skin” layering of the bone surface or an aggressive lesion in the shaft of a long bone or a flat bone. When a plain X-ray shows any of these features, the child should be referred urgently to a specialist bone tumour centre — not to a general orthopaedic clinic — because the next decisions, including who performs the biopsy, are critically important.
MRI and staging scans — seeing the full picture
Before any biopsy is performed, the specialist team arranges an MRI scan of the affected bone. MRI provides the most detailed view of how far the tumour extends within the bone marrow cavity and whether it has grown into the surrounding soft tissue, crossed the joint, or approached major nerves and blood vessels. This information is essential for planning the biopsy position and for later surgical planning. Alongside the MRI, a CT scan of the chest is done to check whether the cancer has spread to the lungs, which are the most common site of distant spread for both osteosarcoma and Ewing sarcoma. Additional scans — including a bone scan or a whole-body MRI — may be arranged to look for spread to other bones.
Biopsy — the most critical step (and why it must be done right)
The definitive diagnosis of any bone tumour requires a biopsy — a tissue sample examined by a specialist pathologist. The biopsy confirms whether the tumour is malignant, identifies the exact tumour type (osteosarcoma vs Ewing sarcoma vs another rare type), and in Ewing sarcoma, molecular testing confirms the characteristic chromosomal rearrangement. The single most important principle is this: the biopsy must be planned and performed by the same surgical team that will carry out the definitive surgery. The biopsy tract — the path through tissue that the needle or incision takes — will later need to be entirely removed along with the tumour. A misdirected biopsy can contaminate muscle compartments or skin, making limb-salvage surgery impossible and forcing an amputation. This is why parents should not accept a biopsy at any hospital without first checking that the surgeon has specialist bone tumour experience.
Pre-operative chemotherapy — treating the whole body first
Once the biopsy confirms the diagnosis and the tumour has been staged, treatment begins with pre-operative (neoadjuvant) chemotherapy delivered over several months before any surgery. This step serves multiple purposes. It reduces the size of the primary tumour, making it more likely that the surgeon can remove it completely with a clear margin. It attacks microscopic cancer cells that may already have spread beyond the visible tumour — cells that are not yet detectable on any scan but that could grow into visible metastases if left untreated. At the end of pre-operative chemotherapy, repeat imaging is performed to assess the tumour’s response before the surgical plan is finalised.
Surgery — removing the tumour, preserving the limb where possible
Surgery is the cornerstone of treatment for osteosarcoma and for Ewing sarcoma when the tumour is resectable. In most children with a limb tumour, the surgical goal is limb-salvage surgery — removing the affected section of bone with a clear surrounding margin and reconstructing the bone using a custom metal implant (endoprosthesis), a biological bone graft, or a combination of both. A prosthesis can often be designed to be expandable in growing children, allowing for lengthening as the child grows. After the tumour is removed, it is examined by the pathologist to determine the percentage of cancer cells that were killed by the pre-operative chemotherapy. A good response (a high percentage of dead cells) is a positive prognostic sign and guides decisions about post-operative chemotherapy.
Post-operative treatment — chemotherapy and, for Ewing, possible radiation
After surgery, treatment continues with post-operative (adjuvant) chemotherapy for several additional months. This phase consolidates the treatment effect and reduces the risk of the cancer returning. The specific agents and the duration of post-operative chemotherapy are guided by the tumour type, the response to pre-operative chemotherapy, and the pathology of the removed specimen. For Ewing sarcoma, radiation therapy plays an additional role in some situations — particularly when surgery cannot achieve a complete tumour removal, when the tumour is in a location that cannot be surgically resected (such as the sacrum or spine), or when the surgical margins after resection are narrow or involved. The radiation oncologist is part of the multidisciplinary tumor board that reviews the case at every stage. Throughout treatment, children are supported by allied care teams — physiotherapy, nutrition, and psychological support — to maintain the child’s strength and wellbeing.
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Common questions
Your questions about bone cancer in children — answered
What causes bone cancer in children?
In the vast majority of children with osteosarcoma or Ewing sarcoma, no single identifiable cause is found. These tumours are not caused by anything the child or the family did — they are not caused by diet, injury, or lifestyle. Bone cancer in children arises from changes in the DNA of developing bone cells that happen during rapid growth. Because both osteosarcoma and Ewing sarcoma peak during the adolescent growth spurt, researchers believe that the rapid bone remodelling during puberty creates an environment where these errors are more likely to occur. A small minority of cases are associated with known genetic conditions or with previous radiation therapy to bone, but most cases occur in otherwise healthy children and teenagers with no family history of bone cancer.
What are the warning signs of bone cancer in children and teenagers?
The most important warning signs of childhood bone cancer are: persistent localised bone pain that worsens over weeks rather than days; pain that is present at rest or wakes a child at night; a visible or palpable lump over a bone or near a joint; and unexplained swelling or warmth around a limb, especially the knee, upper arm, or pelvis. Limping or difficulty using a limb — particularly when there was no injury — is another red flag. It is important to know that bone pain in active children is very common and is usually benign — growing pains, sports injuries, and minor fractures are far more frequent than cancer. However, pain that persists for more than two to three weeks without a clear injury explanation, pain that is getting worse rather than better, or any bone swelling that is firm and not going away warrants a medical review with an X-ray as the first step.
What is the difference between osteosarcoma and Ewing sarcoma?
Osteosarcoma and Ewing sarcoma are the two most common primary bone cancers in children and teenagers, and they differ in their origin, location, and biology. Osteosarcoma arises from osteoblasts — the cells that build bone. It most often occurs around the knee (in the lower end of the thigh bone or upper shin bone) or in the upper arm bone, and it tends to affect older children and teenagers aged 10 to 20. Ewing sarcoma arises from a different cell type, possibly from primitive nerve cells within bone or soft tissue, and can occur in any bone but more commonly affects the flat bones of the pelvis, ribs, and spine, as well as the mid-shaft of long bones. Ewing sarcoma can also arise in soft tissue without involving bone at all. Genetically, Ewing sarcoma almost always carries a specific chromosomal translocation. The treatment approach for each tumour type is different, and the distinction must be confirmed by specialist pathology before treatment begins.
How is bone cancer in children diagnosed?
The diagnostic workup for a suspected bone tumour in a child begins with plain X-rays of the affected limb, which can show characteristic changes inside the bone. If the X-ray raises concern, the next step is an MRI scan of the affected bone — the most detailed way to see how far the tumour extends within the bone and into surrounding soft tissue. A CT scan of the chest is done to check whether the cancer has spread to the lungs. A bone scan or PET scan may be used to check for spread to other bones. The definitive diagnosis always requires a biopsy — a sample of the tumour tissue examined by a specialist pathologist. The biopsy must be planned and performed by the same surgical team that will treat the tumour, because an incorrectly placed biopsy can compromise the ability to perform limb-preserving surgery later. Genetic and molecular testing of the biopsy tissue is also important for Ewing sarcoma, as the specific chromosomal translocation confirms the diagnosis.
Can children with bone cancer keep their limb after treatment?
Yes — in most children with osteosarcoma or Ewing sarcoma of a limb, it is possible to remove the tumour and preserve the limb through surgery called limb-salvage surgery. The surgeon removes the affected segment of bone along with a margin of surrounding tissue, and the bone is reconstructed using a metal implant (endoprosthesis), a bone graft, or a combination of both. Limb-salvage surgery has become the standard of care at specialist centres over the past few decades and has largely replaced amputation for most cases. Whether limb-salvage surgery is possible depends on how much the tumour has responded to chemotherapy before surgery, the location of the tumour relative to nearby nerves and blood vessels, and the age and bone maturity of the child. Amputation is occasionally still necessary — particularly if the tumour involves major blood vessels or nerves, or if a previous biopsy was not well-planned. Even when amputation is required, children and teenagers adapt remarkably well with modern prosthetics and rehabilitation support.
What does the treatment journey for childhood bone cancer look like?
For most children with osteosarcoma or Ewing sarcoma, treatment follows a well-established sequence. It begins with pre-operative chemotherapy (also called neoadjuvant chemotherapy) given over several months before any surgery. The goals are to shrink the tumour, make limb-salvage surgery safer, and eliminate any microscopic spread that may not be visible on scans. After chemotherapy, the tumour is surgically removed — either by limb-salvage surgery or, in a small number of cases, amputation. The removed tumour is then examined by the pathologist to see how well the cancer cells responded to the chemotherapy; this “histological response” is an important guide to further treatment. After surgery, additional post-operative chemotherapy continues for several more months. For Ewing sarcoma, radiation therapy may also play a role, particularly when surgical removal is not possible or complete. Throughout treatment, the paediatric oncology team at CION reviews each child’s case at a multidisciplinary tumor board — medical, surgical, and radiation oncologists together — before every major decision.
Medical disclaimer: This page is for general information only. It does not replace a consultation with a qualified medical professional. If you are worried about symptoms in your child, please see a doctor. CION Cancer Clinics does not diagnose conditions through this website.
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