Chondroma: A Usually Benign Tumor of Cartilage

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Chondroma: A Usually Benign Tumor of Cartilage

By Your Health Magazine Health Information Team

A chondroma is a rare, slow-growing, usually benign tumor made of cartilage. It can develop in or on a bone and, less commonly, in soft tissue. Most chondromas are not cancerous, do not spread to distant parts of the body, and cause no symptoms. The National Cancer Institute’s definition of chondroma notes that pain, swelling, and weakened bones can occur in some cases.

Where Do Chondromas Develop?

Chondromas can occur in children or adults. They are often found in the small bones of the hands and feet, although they may also affect the arms, thighs, ribs, collarbone, pelvis, spine, skull, or nasal sinuses.

The name used for a cartilage tumor may depend on its location:

• Enchondroma: A benign cartilage tumor growing inside a bone. This is one of the most common forms discussed in orthopedic care.
• Periosteal or juxtacortical chondroma: A cartilage tumor developing on the outer surface of a bone.
• Soft-tissue chondroma: A cartilage-forming tumor in soft tissue rather than within bone.

A chondroma is not the same as an osteochondroma, which is a bone outgrowth covered by cartilage. It is also different from chordoma, a rare cancer arising along the spine or at the base of the skull.

What Symptoms Can a Chondroma Cause?

Many chondromas are discovered incidentally when an X-ray or another imaging test is performed for an injury, arthritis, or an unrelated concern. This is similar to other usually benign tumors that may be found unexpectedly, such as an angiomyolipoma of the kidney.

When symptoms occur, they depend on the tumor’s size and location. Possible signs include:

• A painless lump or enlargement of an affected finger or toe
• Localized pain or tenderness
• Swelling
• Bone deformity
• Reduced movement near the affected area
• A fracture after a minor injury because the tumor has weakened the bone

Pain does not automatically mean that a cartilage tumor is cancerous. Arthritis, tendon problems, injuries, and other nearby conditions may be responsible. However, persistent pain at rest or at night, increasing swelling, or a growing mass requires medical evaluation.

How Is a Chondroma Diagnosed?

A clinician begins by reviewing symptoms, previous imaging, medical history, and the location of the lesion. An examination may check for swelling, tenderness, deformity, range of motion, and signs of a fracture.

Diagnostic testing may include:

1. X-rays: These can show the tumor’s location, shape, internal calcification, and effects on the surrounding bone.
2. CT or MRI scans: These provide more detail when the lesion is large, painful, difficult to characterize, or located in a complex area. They can also identify bone erosion or a mass extending beyond the bone.
3. Follow-up imaging: Comparing scans over time can help determine whether a lesion is stable or changing.
4. Biopsy: A tissue sample may be needed if imaging suggests an aggressive tumor or the diagnosis remains uncertain.

Not every chondroma requires a biopsy. Distinguishing an enchondroma from a very low-grade malignant cartilage tumor can be difficult, even when tissue is examined under a microscope. Doctors may combine symptoms, imaging findings, and pathology results rather than relying on a single test. The American Academy of Orthopaedic Surgeons’ enchondroma guide explains how these tumors are evaluated and monitored.

Chondroma Versus Chondrosarcoma

A solitary enchondroma only rarely becomes cancerous. Concern is greater when a lesion grows, damages surrounding bone, or causes unexplained pain at rest. People with multiple enchondromas—such as those associated with Ollier disease or Maffucci syndrome—have a higher risk of chondrosarcoma and generally need individualized follow-up.

Chondrosarcoma is a separate diagnosis and includes tumors with different levels of aggressiveness. The National Cancer Institute’s chondrosarcoma information describes its symptoms, diagnostic testing, and treatment considerations.

Does a Chondroma Need Treatment?

Treatment depends on the tumor’s location, symptoms, appearance, and effect on the strength of the bone. A small lesion with reassuring imaging features may only need observation. The clinician may recommend periodic X-rays or other imaging, although the appropriate schedule varies.

Surgery may be considered when a chondroma:

• Causes ongoing symptoms
• Weakens the bone or contributes to a fracture
• Continues to grow
• Produces significant deformity
• Has imaging features that raise concern about malignancy
• Cannot be confidently distinguished from a more aggressive tumor

A common operation for an enchondroma is curettage, in which the surgeon removes the tumor from inside the bone. The resulting cavity may be filled with bone graft or another material when additional support is needed. Treatment decisions should be made with an orthopedic specialist, particularly when the diagnosis is uncertain.

When to Seek Care

Arrange a medical evaluation if you notice a new lump over a bone, unexplained swelling, persistent bone pain, pain at rest or during the night, or a known cartilage tumor that appears to be changing. Sudden severe pain, visible deformity, or inability to use a limb after a minor injury may indicate a fracture and warrants prompt care.

A primary care clinician can perform an initial assessment and order imaging. An orthopedist may manage a typical benign lesion, while an orthopedic oncologist is often the most appropriate specialist for a painful, enlarging, unusual, or difficult-to-classify cartilage tumor.

Most chondromas remain benign and may never require treatment, but the exact diagnosis matters. Imaging review and appropriate follow-up can confirm whether observation is reasonable or further evaluation is needed. For additional reliable consumer health information, visit the MedlinePlus health topics library.