An enchondroma is a type of benign (noncancerous) bone tumor that originates from cartilage. Cartilage is the specialized, gristly connective tissue from which most bones develop. Cartilage plays an important role in the growth process. There are many different types of cartilage throughout the body. An enchondroma most often affects the cartilage that lines the inside of the bones. The bones most often involved with this benign tumor are the miniature long bones of the hands and feet. It may, however, also involve other bones such as the femur (thighbone), humerus (upper arm bone), or tibia (one of the two lower leg bones).
Enchondromas are the most common type of hand tumor. While it may affect an individual at any age, it is most common between the ages of 10 and 20 years. The occurrence between males and females is equal.
While the exact cause of enchondroma is not known, it is believed to occur either as an overgrowth of the cartilage that lines the ends of the bones, or as a persistent growth of original, embryonic cartilage.
An enchondroma may occur as an individual tumor or several tumors. The conditions that involve multiple lesions include the following:
Ollier's disease (enchondromatosis). When multiple sites in the body develop the tumors.
Maffucci's syndrome. A combination of multiple tumors and angiomas (benign tumors made up of blood vessels).
Individuals with an enchondroma often have no symptoms at all. The following are the most common symptoms of an enchondroma. However, each individual may experience symptoms differently. Symptoms may include:
Hand pain that may occur if the tumor is very large, or if the affected bone has weakened causing a hand fracture
Enlargement of the affected finger
Slow bone growth in the affected area
The symptoms of enchondroma may resemble other medical conditions or problems. Always consult your doctor for a diagnosis.
Because an individual with an enchondroma has few symptoms, diagnosis is sometimes made during a routine physical examination, or if the presence of the tumor leads to a fracture in the hand.
In addition to a complete medical history and physical examination, diagnostic procedures for enchondroma may include the following:
X-rays. A diagnostic test that uses invisible electromagnetic energy beams to produce images of internal tissues, bones, and organs on film.
Radionuclide bone scans. A nuclear imaging method to evaluate any degenerative and/or arthritic changes in the joints; to detect bone diseases and tumors; to determine the cause of bone pain or inflammation. This test helps to rule out any infection or fractures.
Magnetic resonance imaging (MRI). A diagnostic procedure that uses a combination of large magnets, radiofrequencies, and a computer to produce detailed images of organs and structures within the body. This test is done to rule out any associated abnormalities of the spinal cord and nerves.
Computed tomography scan (also called a CT or CAT scan). A diagnostic imaging procedure that uses a combination of X-rays and computer technology to produce horizontal, or axial, images (often called slices) of the body. A CT scan shows detailed images of any part of the body, including the bones, muscles, fat, and organs. CT scans are more detailed than general X-rays.
Specific treatment for enchondroma will be determined by your doctor based on:
Your age, overall health, and medical history
Extent of the disease
Your tolerance for specific medications, procedures, or therapies
Expectations for the course of the disease
Your opinion or preference
Treatment may include:
Surgery in some cases, when bone weakening is present or fractures occur
Bone grafting. A surgical procedure in which healthy bone is transplanted from another part of the patient's body into the affected area.
If there is no sign of bone weakening or growth of the tumor, only observation may be suggested. However, follow-up with repeat X-rays may be necessary. Some types of enchondromas can develop into malignant, or cancerous, bone tumors later. Careful follow-up with a doctor is often recommended.