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Childhood Cancer Types — Parent’s Guide
Solid tumours vs blood cancers in children — what’s the difference
Medically reviewed by Dr. C. Raghavendra Reddy, DM (Medical Oncology, Gold Medal) · Last reviewed June 2026
When a child is diagnosed with cancer — or when a parent is searching for answers after an abnormal blood test or a scan finding — one of the first questions is: what kind is it? Is there a lump somewhere, or is it in the blood? Understanding the difference between a solid tumour and a blood cancer (such as leukemia) matters because the two behave differently, are found differently, and are treated very differently. This page explains both clearly and honestly, without medical jargon, for parents who are trying to make sense of a frightening situation.
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Understanding childhood cancer types
Solid tumour vs leukemia in a child — the two main categories
All childhood cancers fall into one of two broad families. Most parents have heard the word “cancer” used for both a lump in an organ and a blood disease, but these are very different things. Here is a clear breakdown.
Forms a physical mass
Solid tumours
A solid tumour is a mass of abnormal cells that builds up inside a specific organ or tissue. It has a location — in a bone, in the kidney, in the eye, in the brain, in a muscle, or elsewhere. The body of the tumour can usually be seen and measured on imaging (ultrasound, MRI, or CT). In children, common solid tumours include brain tumours (the second most common childhood cancer), neuroblastoma (in the abdomen), Wilms tumour (in the kidney), retinoblastoma (in the eye), osteosarcoma and Ewing sarcoma (in bones), and rhabdomyosarcoma (in muscle). The initial finding is often a visible lump, a symptom from a growing mass pressing on nearby structures, or an incidental finding on imaging.
- Has a specific physical location in the body
- Detected by imaging; confirmed by biopsy of the tissue
- Surgery to remove the tumour is usually part of the treatment plan
- May also need chemotherapy and sometimes radiation
No discrete lump; in the blood or bone marrow
Blood cancers (leukemia & lymphoma)
A blood cancer does not form a single lump in one place. Instead, abnormal cells arise in the bone marrow (the spongy tissue inside large bones that produces all blood cells) or in the lymphatic system (the network of lymph nodes and vessels throughout the body). These abnormal cells multiply and spread through the blood or lymph. Leukemia is the most common childhood cancer overall; lymphoma is closely related and involves the lymphatic system. Because there is no discrete mass, blood cancers are usually invisible on a routine scan in the early stages — they are detected through blood tests and, for confirmation, a bone marrow examination. Symptoms arise because the abnormal cells crowd out the healthy blood cells the body needs.
- No single-location tumour; abnormal cells are widespread
- Detected through blood count and bone marrow test; imaging plays a secondary role
- Treatment is primarily chemotherapy given in structured phases
- Surgery is not a primary treatment for leukemia or most lymphomas
Blood cancer that can form masses
Lymphoma — the in-between case
Lymphoma often surprises parents because it straddles the two categories. Like leukemia, it is a cancer of lymphocytes (white blood cells) — so it is a blood cancer by cell type. But unlike leukemia, lymphoma cells tend to collect in lymph nodes and form masses, which is more like a solid tumour. A child may present with swollen lymph nodes in the neck, chest, or abdomen, or with a mass on a scan. Hodgkin lymphoma and non-Hodgkin lymphoma are the two types in children. Diagnosis requires a biopsy of an affected lymph node or mass, not just a blood test. Treatment is primarily chemotherapy, and the outcome depends on the type and stage of the disease.
- Arises from lymphocytes — classified as a blood cancer
- Can form palpable lymph node masses or organ masses
- Confirmed by biopsy, not blood test alone
- Treated primarily with chemotherapy, sometimes with radiation
Why it matters to your child’s care
Why this distinction changes everything
The category a cancer belongs to does not determine the prognosis by itself, but it determines how it is found and how it is treated — and both matter enormously. A family who brings a child in because of a swollen neck lump and unexplained fever may not know whether the doctor is thinking about lymphoma, a solid tumour, or infection. Understanding the framework helps parents follow the investigation, ask the right questions, and know why each test is being done. At CION, we take time in every consultation to explain what type of cancer we are dealing with, how confident we are in the diagnosis, and what the treatment path looks like — before anything else is decided.
- The investigation pathway differs between the two categories
- Treatment approach (surgery, chemotherapy, radiation sequence) is category-specific
- Understanding the category helps parents follow the plan and ask informed questions
- Our tumor board reviews each case across all relevant specialties before treatment begins
At a glance: blood cancer vs solid tumour in children
| Feature | Solid tumour | Blood cancer (leukemia / lymphoma) |
|---|---|---|
| Where it forms | Inside an organ, bone, muscle, brain, or other tissue | Bone marrow and/or lymphatic system; cells circulate in blood |
| How it is found | Usually as a visible or palpable lump; often on imaging | Blood test (full blood count); bone marrow test for confirmation |
| Early symptoms | Lump, pain or pressure from the mass, organ-specific symptoms | Pallor, tiredness, easy bruising, repeated infections, bone pain |
| Surgery’s role | Central — removing the tumour is usually a core part of treatment | Rarely applicable — there is no discrete mass to surgically remove |
| Chemotherapy’s role | Used before surgery (to shrink the tumour) or after (to clear residual cells) | Primary treatment — given in phases over months to years |
| Common examples in children | Brain tumour, neuroblastoma, Wilms tumour, osteosarcoma, retinoblastoma | ALL (acute lymphoblastic leukemia), AML, Hodgkin and non-Hodgkin lymphoma |
For a complete overview of all childhood cancers, visit the Pediatric Cancer hub. To learn more about the most common blood cancer in children, see our childhood leukemia page.
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The investigation path — what to expect
How doctors diagnose a solid tumour vs a blood cancer in a child
The steps from initial concern to confirmed diagnosis differ depending on whether a solid tumour or a blood cancer is suspected. Understanding the process helps parents know what each test is for and why it cannot be skipped.
The first signal: what the parent or doctor notices
With a solid tumour, the first signal is usually something you can see or feel — a lump under the skin, a swollen belly, a white reflection in the eye in a photo, a child limping without injury, or a headache that worsens in the morning. With a blood cancer like leukemia, there is usually no lump; instead the parent notices that the child looks unusually pale, is more tired than normal, bruises easily, or keeps getting infections. The symptoms of blood cancer can look like anaemia or a virus, which is one reason diagnosis is sometimes delayed. If your instinct as a parent says something is wrong and it is not improving, ask for a blood test.
The first test: blood count or imaging — depending on the suspicion
When a blood cancer is suspected, the first test is a full blood count (FBC) — a simple blood draw. In leukemia, the FBC often shows abnormal numbers of white blood cells (very high, very low, or normal but with abnormal-looking cells), combined with low red blood cells (anaemia) and low platelets. A blood film (looking at the cells under a microscope) may show immature cells called blasts. This result alone does not confirm leukemia, but it is enough to require urgent specialist review. When a solid tumour is suspected, imaging comes first — typically an ultrasound (to look for a mass in the abdomen or neck), or an MRI (to look at the brain or soft tissues). Imaging locates the mass and gives the team an initial sense of its size and relationship to nearby structures.
Confirming the diagnosis: biopsy or bone marrow test
Neither an FBC nor a scan is enough to confirm a cancer diagnosis on its own. Confirmation always requires tissue. For a blood cancer, the confirmatory test is a bone marrow aspirate and biopsy — a procedure done under sedation or general anaesthesia in which a small sample of marrow is taken from the back of the hip. The marrow is examined to count blast cells, identify the exact type of leukemia using immunophenotyping, and check for genetic and molecular changes that determine the treatment protocol. For a solid tumour, the tissue comes from a biopsy of the tumour itself — either a core needle biopsy (a needle guided by ultrasound or CT to take a core of tissue) or an open surgical biopsy. The biopsy tells the team the tumour type and grade, and additional molecular testing helps determine whether it carries genetic changes that affect treatment or risk.
Staging: how far has the disease spread?
Once the cancer type is confirmed, the team needs to know its extent. For a solid tumour, staging uses imaging — typically CT of the chest, abdomen, and pelvis, and sometimes a PET-CT or bone scan — to determine whether the tumour is localised to one site or has spread to lymph nodes or other organs. For most blood cancers, staging works differently: because leukemia is already a systemic (whole-body) disease at diagnosis, staging is replaced by risk stratification — a classification based on the age and white cell count at diagnosis, the type of leukemia cell, and the genetic features of those cells. This risk category directly determines the intensity of the treatment. For lymphoma, both staging (imaging) and biopsy are used together.
The tumour board review — before any treatment decision
At CION, every child’s case is reviewed by a multidisciplinary tumour board that includes medical oncologists, surgical oncologists, radiation oncologists, radiologists, and pathologists, before a treatment recommendation is made. For a solid tumour, the board determines the optimal sequence of surgery, chemotherapy, and radiation. For a blood cancer, the board reviews the risk classification and selects the appropriate protocol. This step exists because childhood cancer treatment is not a one-size-fits-all decision — the right plan for one child is not necessarily right for another with the same diagnosis, because the underlying biology can differ. A 45-minute consultation with you follows the board discussion, where the team explains the plan in clear language and answers every question you have.
Treatment — what the journey looks like
How treatment for solid tumours differs from blood cancer treatment
Once the type is confirmed and staged, the treatment plan is built around the biology of the cancer. The two pathways are genuinely different — here is what families can expect.
Solid tumour treatment
Solid tumour: surgery is usually central
For most solid tumours in children, the goal is to remove the tumour surgically. Surgery is often combined with chemotherapy, which may be given before the operation (to shrink the tumour and make it easier and safer to remove) or after (to eliminate any microscopic cancer cells left behind). Radiation therapy is used selectively — particularly for tumours that cannot be fully removed, or for certain tumour types where radiation is part of the standard protocol. The exact combination and sequence depend on the tumour type, its location, and the results of molecular testing. The treatment team plans the sequence carefully to give the best outcome while protecting the child’s growing body from unnecessary harm.
Blood cancer treatment
Blood cancer: chemotherapy in phases
For leukemia, there is no tumour to remove — the abnormal cells are distributed throughout the blood and bone marrow. Treatment is structured chemotherapy given in three phases. The induction phase (the first four to six weeks) aims to destroy enough leukemia cells to bring the disease into remission. The consolidation phase (several months) uses additional chemotherapy to eliminate any remaining leukemia cells that were not visible. The maintenance phase (one to two years for most ALL cases) uses lower-dose chemotherapy to keep the disease in remission. Some higher-risk children may need a stem cell transplant in addition. For lymphoma, chemotherapy is similarly central, though the specific protocol differs by lymphoma type and stage.
A note for families: Treatment protocols are highly individualised. The information above describes the general approach for each cancer category; your child’s specific plan will depend on the exact diagnosis, risk category, and their overall health. Please do not make any treatment decision based on a website — speak with a paediatric oncologist.
To read about specific solid tumours in children: neuroblastoma · Wilms tumour · bone cancer in children. For blood cancers: childhood leukemia · lymphoma in children.
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Common questions
Your questions about solid tumours and blood cancers in children — answered
What is the difference between a solid tumour and a blood cancer in a child?
A solid tumour is a mass of abnormal cells that forms a distinct lump inside the body — in an organ, a bone, a muscle, the brain, or another tissue. The lump has a physical location that a scan or an examination can detect. Examples in children include brain tumours, Wilms tumour (in the kidney), neuroblastoma (in the abdomen), retinoblastoma (in the eye), osteosarcoma (in a bone), and rhabdomyosarcoma (in muscle tissue). A blood cancer — such as leukemia or lymphoma — does not usually form a single lump. Instead, abnormal cells arise in the bone marrow or lymphatic system and circulate through the blood or lymph fluid. Because there is no discrete mass, blood cancers often do not show up on imaging in the early stages; diagnosis relies on blood tests and bone marrow examination. Both categories are serious and fully treatable at a specialist centre; the distinction matters because the diagnostic approach and the treatment pathway differ considerably between them.
Which is more common in children — solid tumours or blood cancers?
Blood cancers, specifically leukemia, are the most common type of cancer in children overall, accounting for the largest single category of childhood cancer diagnoses. Lymphoma (which involves abnormal lymphocytes in the lymphatic system and lymph nodes) is also among the more frequent diagnoses. Solid tumours as a group are very common too, but any individual solid tumour type — such as Wilms tumour or neuroblastoma — is rarer than leukemia. The relative frequency of each cancer type shifts with the child’s age: brain tumours are more frequently seen in younger children and adolescents; osteosarcoma and Ewing sarcoma are more common in teenagers; and infant tumours such as neuroblastoma tend to cluster in the very youngest age group. A paediatric oncologist reviews both the tumour type and the child’s age when planning investigation and treatment.
How does a doctor find out whether a child has a solid tumour or a blood cancer?
The investigation is different for each. For a suspected solid tumour, imaging — usually an ultrasound first, then an MRI or CT — is used to locate and characterise the lump, and a biopsy (a small tissue sample) confirms what type of tumour it is and whether it is cancerous. For a suspected blood cancer, the process begins with a full blood count (FBC) and blood film examination, which often reveals abnormal cells. If the FBC is concerning, a bone marrow test (aspirate and biopsy) confirms the diagnosis and identifies the type of leukemia or lymphoma. In both situations, additional tests — including molecular and genetic analysis of the tumour cells — are done to determine the exact biology, because that directly influences which treatment protocol is used.
Do solid tumours and blood cancers in children require different treatments?
Yes, the treatment approach differs considerably. For solid tumours, surgery often plays a central role — removing the tumour, or as much of it as safely possible, is usually part of the plan. This may be combined with chemotherapy (which can be given before surgery to shrink the tumour, or after to eliminate remaining microscopic disease) and sometimes radiation therapy. The sequence and combination depend on the tumour type and stage. For blood cancers such as leukemia, there is no surgical target — the abnormal cells are dispersed throughout the blood and bone marrow. Treatment is primarily chemotherapy delivered in structured phases (induction, consolidation, and maintenance). Some children with high-risk blood cancers require a stem cell transplant. Radiation is used selectively, particularly when there is central nervous system involvement. In both pathways, the multidisciplinary team at CION discusses every child’s case at a tumour board before any treatment begins.
My child has swollen lymph nodes — is that a solid tumour or a blood cancer?
Swollen lymph nodes are among the most common signs parents notice, and in the vast majority of children they are caused by infection — not cancer. When a doctor is concerned about lymph nodes that have been swollen for more than two to four weeks without explanation, or that are large, firm, painless, or accompanied by other unexplained symptoms (fever, night sweats, weight loss, or unusual tiredness), further investigation is needed. Swollen lymph nodes can be a feature of lymphoma (which is categorised as a blood cancer that involves the lymphatic system, not a solid organ tumour) or, less commonly, of other cancers that have spread to lymph nodes. A blood count, imaging, and sometimes a lymph node biopsy are used to determine the cause. This page cannot guide clinical decisions — if you are worried about your child’s lymph nodes, please arrange a proper medical evaluation.
Where does lymphoma fit — is it a solid tumour or a blood cancer?
Lymphoma occupies a position between the two categories, which is why it sometimes causes confusion. Like leukemia, lymphoma arises from abnormal lymphocytes (white blood cells). However, unlike leukemia, lymphoma cells tend to collect in lymph nodes and lymphoid tissues and form masses — so there can be palpable lumps (swollen lymph nodes) or organ masses visible on a scan. Because of this, lymphoma shares characteristics with both categories: it is a blood cancer by cell type (lymphocytes gone wrong) but can produce solid masses. Hodgkin lymphoma and non-Hodgkin lymphoma are the two main types in children. Diagnosis requires a biopsy of affected tissue to confirm the cell type, and staging imaging to determine how far the disease has spread. Treatment is primarily chemotherapy and, in some types, radiation therapy. Surgery is rarely the primary treatment.
*All clinical information on this page is for educational purposes and does not constitute medical advice. Please consult a qualified paediatric oncologist before making any decision about your child’s care.
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