An enchondroma is a benign cartilage tumour within a bone, often found during imaging for another problem. Finding one does not automatically mean that surgery is needed.[1]
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Could it become cancer?
That may be the question behind everything else in the report. A single enchondroma rarely becomes cancerous. Conditions involving multiple cartilage tumours, such as Ollier disease or Maffucci syndrome, carry a different risk. There is also a separate question: how certain is the diagnosis? Some low-grade cartilage cancers can resemble an enchondroma, which is why the images and symptoms need to be assessed together.[1]
Start with the reason for the scan
A knee or shoulder can hurt for reasons separate from a nearby cartilage lesion. In selected long-bone lesions followed with MRI, new pain also often had another explanation.[2]
The scan finding and the reason for discomfort need to be considered together. In a study of apparently benign long-bone lesions, patients commonly presented because adjacent tissues were painful.[3]
What makes the finding reassuring or concerning?
Destruction of the outer bone or growth into surrounding soft tissue needs specialist evaluation. Doctors interpret these findings with the lesion's location and other features. Size alone cannot settle the diagnosis.[4]
Enchondromas in the hands and feet can weaken bone and lead to fractures. Multiple lesions, including those associated with Ollier disease, need a separate assessment.[1]
Why monitoring may be the treatment plan
Leaving a tumour in place can feel difficult to accept. For a reassuring lesion that is not causing symptoms, observation may be appropriate.[1] Choosing this approach means weighing what surgery would solve against the risks of operating. Those risks are discussed below.
An MRI study supports observation for carefully selected long-bone cartilage lesions. It does not prove that every lesion is harmless or remove the need for reassessment if the findings change.[2]
More about the evidence
The MRI study included lesions found during investigations for arthritis, meniscal injury or shoulder symptoms. Most lesions remained stable or showed signs of regression, and none developed the aggressive imaging features of a high-grade chondrosarcoma during follow-up.[2]
The study was retrospective and included both suspected enchondromas and atypical cartilaginous tumours. Most did not have a biopsy. Its findings apply to the selected long-bone lesions studied, rather than to every cartilage tumour, particularly those in the pelvis or with aggressive features.[2]
Agree what monitoring means for you. For selected adults with a single, painless cartilage lesion found by chance in a long bone, guidance allows no routine follow-up when imaging shows no concerning features. New symptoms need review. This advice does not apply to every cartilage tumour.[4]
If surveillance has been recommended, keep those appointments even when you feel well. In one retrospective study, a growing cartilage lesion was found in a patient without pain.[3]
Report new or increasing pain, especially persistent pain at rest or at night. The assessment needs to establish whether the lesion is responsible; pain alone does not establish cancer.[1] A review may lead to further investigation. It does not automatically mean surgery.
Would a biopsy settle the uncertainty?
Sometimes a tissue sample is needed. Benign and low-grade cartilage tumours can look similar under the microscope, so biopsy is interpreted alongside symptoms and images.[1]
When might surgery be considered?
Bone weakness, symptoms linked to the lesion or concerning changes may justify treatment. When curettage is appropriate, the surgeon removes tissue from within the bone and may fill the cavity with graft or another material.[1]
Surgery also has consequences. A study comparing treatment approaches for selected long-bone lesions reported postoperative fractures and problems related to fixation in some operated patients. It did not establish that surgery gives better results than observation for all such lesions.[5]
More about the evidence
In this study, even some removed tumours could not be confidently separated into enchondroma or atypical cartilaginous tumour on pathology. This diagnostic overlap explains why specialist discussion may still matter after tissue has been examined.[5]
Treatment was chosen individually rather than randomly assigned.[5]
Leave with a clear next step
The report should lead to a plan that answers the questions relevant to you:
- Is this a confidently benign finding or a cartilage lesion that remains uncertain?
- What is the most likely explanation for my pain?
- Do I need monitoring, and who will arrange it?
- Which new symptoms or scan changes should bring me back sooner?
- If surgery is suggested, what problem is it expected to solve?
You can request a second opinion if you would like help understanding the recommendation. Share the images and reports you already have; the team should help obtain any missing material needed for the review.
