Chondrosarcoma: Symptoms, Causes, Types, and Treatment Options Explained

Q: Is chondrosarcoma curable?

In many cases, yes. Most chondrosarcomas are low-grade, slow-growing tumors that are cured with complete surgical removal, especially when the operation achieves clear margins of healthy tissue. High-grade and dedifferentiated subtypes are harder to cure and carry a poorer prognosis.

Q: How common is chondrosarcoma?

It is rare. The U.S. incidence is about 1 in 200,000 people per year (roughly 2–4 per million), and it accounts for about 20–30% of all bone sarcomas. It is the most common primary bone cancer in adults but represents only about 0.2% of all new cancer cases.

Q: What are the first signs of chondrosarcoma?

The earliest sign is typically a dull, increasing pain in the affected bone that persists at rest and is often worse at night. A growing lump or swelling may appear over the bone. Because the tumor grows slowly, symptoms often build over 10 to 15 months before diagnosis.

Q: Where does chondrosarcoma most often occur?

Most tumors form in the pelvis, hip, and shoulder. Within the skeleton, about 45% arise in the extremities, about 31% in the axial skeleton (including the spine), and around 20% in the pelvic bones. The upper thighbone (proximal femur) is the single most common site.

Q: How is chondrosarcoma different from osteosarcoma?

Osteosarcoma is a bone-forming cancer that peaks in teenagers, while chondrosarcoma is a cartilage-forming cancer that peaks after age 40. Chondrosarcoma spreads less often at diagnosis (about 9.4% versus 21.4% for osteosarcoma), and its treatment relies on surgery rather than chemotherapy.

Q: Does chondrosarcoma spread (metastasize)?

It can, but less often than many other bone cancers. When it spreads, chondrosarcoma most commonly travels to the lungs. Distant metastases are present at diagnosis in about 9.4% of cases. Some rare subtypes, such as mesenchymal and dedifferentiated chondrosarcoma, are far more likely to spread.

Q: What treatments are used for chondrosarcoma?

Surgery is the main treatment, either scraping out small low-grade tumors or removing the tumor with a margin of healthy tissue, often with limb-salvage reconstruction. Radiation therapy helps when surgery is difficult or incomplete, and chemotherapy is rarely used because chondrosarcoma usually does not respond to it, except in some fast-growing subtypes.

Q: Who is most likely to get chondrosarcoma?

Adults over 40 account for more than 70% of cases, with a mean age around 51 and a slight male predominance. People with Ollier's disease or Maffucci's syndrome face a 20–25% lifetime risk, and those with multiple hereditary exostoses face a smaller but elevated risk of about 0.6–2.8%.

Dr. Baraa Alnahhal

4 days ago

12 min read

Updated: 2 days ago

Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: September 2026

Editorial note: This article is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for decisions about your health. Content is based on the sources listed in the References section; the primary clinical source pages were medically reviewed on Dec. 04, 2024 [1] [2].

TL;DR

Chondrosarcoma is a rare cancer of cartilage-producing cells that usually forms in the bone, most often in the pelvis, hip, and shoulder. Most cases grow slowly and are treated with surgery; rare aggressive types may need radiation, and chemotherapy is used only in select fast-growing cases.

Quick Answer: What is chondrosarcoma?

Chondrosarcoma is a rare type of cancer that usually begins in the bones but can sometimes occur in soft tissue near bones. It most often affects the pelvis, hip, and shoulder and typically strikes adults over 40. Most cases grow slowly and are treated with surgery to remove the tumor, while rare fast-growing types have a higher risk of spreading. The estimated U.S. incidence is about 1 in 200,000 people per year [1] [2] [4].

What exactly is chondrosarcoma?

Chondrosarcoma is a rare cancer that develops from cartilage-producing cells. Cartilage is the flexible connective tissue found in joints, the ends of bones, and structures such as the ears and nose. When these cells develop DNA changes, they can multiply abnormally and form a tumor [1] [3].

Most chondrosarcomas form inside the bone itself, but a small number begin in the soft tissue near bones, sometimes called extraskeletal chondrosarcoma [3] [6]. The tumors most often develop in the pelvis, hip, and shoulder, and less commonly in the bones of the spine [1].

Chondrosarcoma matters in one broader context: it is the second most common primary bone malignancy after osteosarcoma, and the most common primary bone cancer diagnosed in adulthood [4] [5]. It accounts for roughly 20–30% of all bone sarcomas [4].

Key facts at a glance

| Fact | Detail | |---|---| | What it is | Cancer arising from cartilage-producing cells | | Where it forms | Usually in bone; occasionally in nearby soft tissue | | Most common sites | Pelvis, hip, shoulder; rarely the spine | | Typical patient | Adult over 40; mean age of diagnosis around 51 | | U.S. incidence | About 1 in 200,000 per year (~2–4 per million) | | Ranking | Second most common primary bone cancer | | Main treatment | Surgery |

What are the symptoms of chondrosarcoma?

Chondrosarcoma tends to grow slowly, so it often causes no signs or symptoms at first. In fact, people typically live with symptoms for an average of 10 to 15 months before receiving a diagnosis [1] [4].

When symptoms do appear, they follow a recognizable pattern. The earliest warning is usually a dull, increasing pain in the affected area, which can be worse at night and persist even at rest [4]. A growing lump or area of swelling may become visible or palpable over the bone [1] [4].

| Symptom | What it looks like | |---|---| | Increasing pain | Dull, persistent, often worse at night; grows over weeks to months | | Growing lump or swelling | Firm mass over the affected bone | | Spinal cord pressure | Weakness in the legs; bowel or bladder control problems | | Pathologic fracture | Bone breaks more easily because the tumor weakens it |

If the tumor presses on the spinal cord, it can cause weakness and bowel or bladder control problems [1]. High-grade tumors can invade surrounding bone, occasionally leading to a fracture through the weakened area [4]. In some patients with surface or secondary tumors, a palpable mass is the first noticeable sign [4].

Figure 1: Normal cartilage and bone compared with a chondrosarcoma tumor, plus the most common body sites (pelvis ~20%, proximal femur, shoulder, and spine).

What causes chondrosarcoma?

It is not clear what causes chondrosarcoma. Like all cancers, it begins when a cell develops changes, or mutations, in its DNA. A cell's DNA contains the instructions that tell it what to do; those instructions normally tell the cell when to multiply and when to die. In chondrosarcoma, the altered instructions tell the cell to multiply quickly and to continue living when healthy cells would die. The accumulating cells form a tumor that can invade and destroy normal tissue and, in time, can break away and spread to other areas of the body [1].

Researchers have found that mutations in two genes called IDH1 and IDH2 are frequently present in chondrosarcoma tumors. These mutations are acquired during life, not inherited [6].

What the research says

"We do not know why the damage occurs in most cases... a pair of genes called IDH1 and IDH2 were damaged (mutated) in many tumors. We don't know why these genes get damaged but we do know that the damage is not inherited." — Bone Cancer Research Trust [6]

Who is at risk for chondrosarcoma?

Several factors raise the odds of developing chondrosarcoma. Age is the strongest single factor: most cases occur in middle-aged and older adults, with more than 70% of patients over 40 at diagnosis and a mean age of presentation around 51 [1] [4] [5]. A slight male predominance has been reported [4] [6].

Certain pre-existing bone conditions also increase risk. Ollier's disease and Maffucci's syndrome cause noncancerous bone growths called enchondromas, and these growths sometimes transform into chondrosarcoma. Patients with either condition face an estimated 20–25% lifetime risk of chondrosarcoma [1] [6]. People with multiple hereditary exostoses, a condition producing multiple benign bone growths, have roughly a 0.6–2.8% risk [6]. Prior radiation treatment for another cancer can also raise risk slightly [6].

| Risk factor | Estimated effect | |---|---| | Age over 40 | Over 70% of patients diagnosed after 40; mean age ~51 | | Male sex | Slight male predominance | | Ollier's disease | ~20–25% lifetime risk of chondrosarcoma | | Maffucci's syndrome | ~20–25% lifetime risk of chondrosarcoma | | Multiple hereditary exostoses | ~0.6–2.8% risk | | Prior radiation therapy | Slightly elevated risk |

Importantly, chondrosarcoma can occur at any age, and most people with these risk factors never develop the disease. The underlying cause remains unknown in most cases [1] [6].

What are the types of chondrosarcoma?

Chondrosarcoma is not one single disease. Pathologists classify tumors by grade (how abnormal the cells look) and by subtype, and both shape the treatment plan [4] [5].

Conventional chondrosarcoma is by far the most common form, making up about 85% of cases in one clinical review [4]. These are graded 1 (low), 2 (intermediate), or 3 (high) based on how much the tumor cells differ from normal cartilage. Grade 1 tumors are the least aggressive and often behave almost like benign lesions, while grade 3 tumors grow and spread more readily [4] [5].

Less common subtypes behave very differently from each other:

| Subtype | Share of cases | Behavior | Typical age | |---|---|---|---| | Conventional (grades 1–3) | ~85% (review); ~75% (UK registry) | Slow to moderate growth; grade 1 is least aggressive | Mostly over 50 | | Dedifferentiated | ~10% | High grade, very aggressive; poor prognosis | 50–60 | | Mesenchymal | <2% | Very aggressive; 70% in bone, 30% in soft tissue | Teens and young adults | | Clear cell | <2% | Low grade, slow growing | 30s–40s, more often men |

Secondary chondrosarcomas are another distinction: they arise from benign bone growths such as enchondromas or osteochondromas, whereas primary tumors start in otherwise healthy bone [5]. If chondrosarcoma spreads, it most commonly travels to the lungs, and distant spread is seen at diagnosis in about 9.4% of cases — lower than the 21.4% seen in osteosarcoma [5] [7].

How is chondrosarcoma diagnosed?

Diagnosis follows a sequence of examination, imaging, and biopsy, planned carefully so that each step supports the eventual treatment.

The process starts with a physical exam. The doctor asks about signs and symptoms and examines the body to gather clues about the diagnosis [2].

Imaging tests come next. X-rays are the first step and classically show calcification in a "rings and arcs" pattern, reflecting the cartilage matrix. MRI is the gold standard for defining the tumor's exact extent, its invasion into surrounding soft tissue, and its relationship to nearby critical structures. CT scanning shows bony destruction and matrix mineralization in detail, while a bone scan can check whether disease exists elsewhere in the skeleton [2] [4].

| Diagnostic step | Purpose | |---|---| | Physical exam | Symptom history and body examination | | X-ray | First-line imaging; "rings and arcs" calcification pattern | | MRI | Gold standard; maps tumor extent and soft-tissue invasion | | CT scan | Bony destruction and matrix mineralization detail | | Bone scan | Screens the whole skeleton for additional tumors | | Biopsy | Confirms the diagnosis and assigns the tumor grade |

The third step is a biopsy — a procedure to collect suspicious tissue and send it to a laboratory, where doctors analyze it to determine whether it is cancer [2]. Biopsy planning requires special care: the sample must be collected in a way that will not interfere with the future surgery to remove the cancer. For this reason, expert guidelines recommend a referral to a team with dedicated experience in treating chondrosarcoma before the biopsy is performed [2] [4].

Distinguishing a slow-growing grade 1 chondrosarcoma from a benign enchondroma remains one of the hardest challenges in this field, and imaging alone cannot settle it; the biopsy reading by an experienced sarcoma pathologist is decisive [4].

How is chondrosarcoma treated?

Chondrosarcoma treatment often involves surgery to remove the cancer. Other treatments might be recommended in certain situations. The best options depend on the tumor's location, how quickly it is growing, whether it has grown into other structures, the patient's overall health, and their preferences [2].

Surgery is the backbone of treatment. The goal is to remove the cancer along with a margin of healthy tissue around it. For small, slow-growing chondrosarcomas in the arms and legs, surgeons may scrape the cancer cells out of the bone, then apply cold gas or a chemical to kill remaining cells and repair the bone with a graft or cement if needed. Most chondrosarcomas require removing more of the bone. In an arm or leg, removing the entire limb might be necessary, but surgeons preserve the limb whenever possible through limb-salvage surgery, in which the affected bone is replaced or reconstructed with artificial components [1] [2].

Figure 2: The surgical decision path for chondrosarcoma — curettage for small low-grade tumors, wide resection with limb salvage or prosthetic replacement for most others, plus the roles of radiation and chemotherapy.

Radiation therapy uses high-powered energy beams, from sources such as X-rays or protons, to kill cancer cells. It may be recommended when the tumor's location makes surgery difficult, when the cancer cannot be fully removed during surgery, or to control cancer that has spread to other areas [2].

Chemotherapy uses drugs to kill cancer cells, but it is not often used for chondrosarcoma because this cancer frequently does not respond to it. Some fast-growing types, such as dedifferentiated or mesenchymal variants, may respond [2].

When should you see a doctor about bone pain?

Increasing pain in a bone or joint deserves attention, but most joint pain is not cancer. The pattern matters more than the presence of pain. Seek a medical evaluation promptly if pain is persistent and worsening, continues through the night or at rest, is accompanied by a new lump or swelling, or follows a fracture from minimal trauma. If you already know you have enchondromas, Ollier's disease, or Maffucci's syndrome, report any new pain or swelling without delay, since those conditions carry a meaningful transformation risk [1] [4] [6].

Red flags that need same-day or emergency attention include new leg weakness or loss of bowel or bladder control, which can signal pressure on the spinal cord, and a fracture through a bone with only minor injury [1].

Figure 3: Chondrosarcoma warning signs — persistent night pain, growing lump, and spinal-cord pressure red flags, with guidance on when to see a doctor and when to seek emergency care.

What is the outlook for people with chondrosarcoma?

Prognosis depends heavily on tumor grade and subtype. Low-grade conventional tumors, which represent most cases, grow slowly, rarely spread, and carry a favorable outlook after complete surgical removal. High-grade and dedifferentiated tumors are aggressive and carry a poorer prognosis; one SEER database analysis found a 5-year overall survival of about 18% for dedifferentiated chondrosarcoma [8].

For all bone and joint cancers combined, the U.S. 5-year relative survival is 68.7%, with roughly 4,110 new cases and 2,210 deaths estimated in 2026 [3]. These combined figures include childhood-dominant cancers such as osteosarcoma, so they should be interpreted cautiously as a proxy for chondrosarcoma specifically — published reviews place chondrosarcoma 10-year survival in a broad 30–80% range depending on grade, site, and surgery quality [9].

What questions should you ask your doctor?

Preparing questions in advance helps you make the most of each appointment. For a suspected or confirmed chondrosarcoma, useful questions include [2]:

| Category | Questions to ask | |---|---| | Diagnosis | What type of cancer do I have? What grade? Will I need additional tests? | | Treatment | What are my treatment options? Can treatments cure my cancer? Is there one treatment you feel is best for me? | | Expectations | If my cancer can't be cured, what can I expect from treatment? How soon do I need to begin treatment? | | Daily life | What are the potential side effects of each treatment? How will treatment affect my daily life? Can I continue working? | | Follow-up | Are there clinical trials available to me? What will determine whether I should plan follow-up visits? |

Your doctor will likely ask about when symptoms began, whether they are continuous or occasional, what seems to improve or worsen them, and whether anyone in your family has cancer [2].

How can you cope after a chondrosarcoma diagnosis?

A cancer diagnosis changes life for many people, and most patients find their own ways of coping with the emotional and physical changes. Learning enough about the cancer to make informed care decisions builds confidence; keeping friends and family close provides both practical and emotional support; and finding someone to talk with — a counselor, medical social worker, clergy member, or support group — helps many people process their fears [2].

The bottom line

Chondrosarcoma is a rare, usually slow-growing cancer of cartilage cells that most often affects the pelvis, hip, and shoulder of adults over 40. Its three main symptoms — increasing pain, a growing lump, and (with spinal involvement) weakness or bladder problems — are easy to overlook because they develop gradually, which is why diagnosis is often delayed by 10 to 15 months. Surgery is the cornerstone of treatment; radiation helps when surgery is incomplete or impractical, and chemotherapy is reserved for rare fast-growing subtypes. If you have persistent bone pain, an enlarging lump, or a known enchondroma condition, see a doctor promptly and ask about referral to a sarcoma-experienced center.

If you or a loved one are facing a possible chondrosarcoma diagnosis, talk to a qualified healthcare provider today — early, expert evaluation makes the biggest difference.

Frequently Asked Questions

1. Is chondrosarcoma curable? In many cases, yes. Most chondrosarcomas are low-grade, slow-growing tumors that are cured with complete surgical removal, especially when the operation achieves clear margins of healthy tissue. High-grade and dedifferentiated subtypes are harder to cure and carry a poorer prognosis.

2. How common is chondrosarcoma? It is rare. The U.S. incidence is about 1 in 200,000 people per year (roughly 2–4 per million), and it accounts for about 20–30% of all bone sarcomas. It is the most common primary bone cancer in adults but represents only about 0.2% of all new cancer cases.

3. What are the first signs of chondrosarcoma? The earliest sign is typically a dull, increasing pain in the affected bone that persists at rest and is often worse at night. A growing lump or swelling may appear over the bone. Because the tumor grows slowly, symptoms often build over 10 to 15 months before diagnosis.

4. Where does chondrosarcoma most often occur? Most tumors form in the pelvis, hip, and shoulder. Within the skeleton, about 45% arise in the extremities, about 31% in the axial skeleton (including the spine), and around 20% in the pelvic bones. The upper thighbone (proximal femur) is the single most common site.

5. How is chondrosarcoma different from osteosarcoma? Osteosarcoma is a bone-forming cancer that peaks in teenagers, while chondrosarcoma is a cartilage-forming cancer that peaks after age 40. Chondrosarcoma spreads less often at diagnosis (about 9.4% versus 21.4% for osteosarcoma), and its treatment relies on surgery rather than chemotherapy.

6. Does chondrosarcoma spread (metastasize)? It can, but less often than many other bone cancers. When it spreads, chondrosarcoma most commonly travels to the lungs. Distant metastases are present at diagnosis in about 9.4% of cases. Some rare subtypes, such as mesenchymal and dedifferentiated chondrosarcoma, are far more likely to spread.

7. What treatments are used for chondrosarcoma? Surgery is the main treatment, either scraping out small low-grade tumors or removing the tumor with a margin of healthy tissue, often with limb-salvage reconstruction. Radiation therapy helps when surgery is difficult or incomplete, and chemotherapy is rarely used because chondrosarcoma usually does not respond to it, except in some fast-growing subtypes.

8. Who is most likely to get chondrosarcoma? Adults over 40 account for more than 70% of cases, with a mean age around 51 and a slight male predominance. People with Ollier's disease or Maffucci's syndrome face a 20–25% lifetime risk, and those with multiple hereditary exostoses face a smaller but elevated risk of about 0.6–2.8%.