An enchondroma is a benign bone tumour made up of cartilage tissue that usually grows inside the long bones, for example in the fingers, toes, or thigh bone.
What is behind the diagnosis?
An enchondroma is not a malignant condition. It is what is called a benign growth. This means that cells inside the bone multiply and form cartilage tissue where it would not normally be found. These changes most often develop in the small bones of the hands or feet, but they can also appear in larger bones such as the upper arm or thigh.
Most people find out about an enchondroma by chance. It is often spotted during an X-ray taken for another reason, such as after an injury, because the bone looks slightly different in that area. Sometimes it does cause problems though, for example when the affected bone becomes weaker and breaks more easily.
What does this mean for everyday life?
Many enchondromas cause no trouble at all and go unnoticed throughout a person's life. They usually grow slowly and only become noticeable if they increase in size or start causing symptoms. A typical sign can be a painless thickening or swelling on a bone. In rare cases, pain or a bone fracture can occur because the tissue in that area is less stable.
People who receive this diagnosis often wonder whether it is serious or whether there is a dangerous illness behind it. The answer is that an enchondroma is harmless in the vast majority of cases. It is not cancer, and the risk of it developing into a malignant change is very low.
How is an enchondroma diagnosed?
It is usually identified using imaging methods such as X-ray, and sometimes also through an MRI scan or CT scan. On an X-ray, the tumour appears as a rounded, mostly clearly defined change inside the bone. A tissue sample is only rarely needed, for example when it is unclear whether the growth is truly an enchondroma or something else.
Does it need to be treated?
In most cases, no treatment is needed. As long as there are no symptoms and the tumour stays small, regular monitoring is enough. This means that X-rays are taken at set intervals to check whether anything has changed.
However, if the enchondroma grows larger, causes pain, or weakens the bone so much that a fracture becomes a risk, an operation may be a good option. The changed cartilage tissue is removed and the bone is stabilised. Such procedures are usually straightforward when the tumour is small and located in the fingers or toes. In larger bones, the operation can be more involved, but it is generally well planned and manageable.
Common worries and what they really mean
A diagnosis of a tumour in the bone can sound frightening at first. Many people worry that a serious illness such as bone cancer is behind it, or that the tumour will grow and spread. With an enchondroma, however, this is extremely rare. Most of these changes remain stable for years and do not cause any further problems.
Some people wonder whether they need to be careful in daily life or whether certain activities could be dangerous. As long as there are no symptoms and the bone is stable, there are usually no restrictions. With large enchondromas or after a bone fracture, it may be sensible to avoid certain sports or physical strain, but this is discussed individually with the treating doctor.
When should things be looked at more closely?
Only in very rare cases can an enchondroma change and become malignant. Signs of this include rapid growth, persistent pain, or changes visible on an X-ray. In such situations, investigations are stepped up and a tissue sample may be taken to make sure no malignant condition is present.
Anyone who receives this diagnosis can therefore feel reassured in the vast majority of cases. Regular check-ups are important for catching any changes early, but the outlook is generally very good.
