What are chondromas?

Chondromas are benign (not cancerous) tumors made of cartilage that are found mostly in the small bones of the hand and feet.

  • They can also occur in the humerus (upper arm), femur (thigh bone) and ribs.
  • These tumors rarely produce symptoms, but can cause the affected bone to easily fracture.
  • They don't spread and usually stop growing when your child's bones reach full growth potential.

They are classified as one of two types depending on where on the bone they are located:

  • Echondromas: This kind of chondroma is found in the marrow cavity of the bone
  • Periosteal Chondromas: This kind of chondroma forms at the surface of the bone

Can chondromas become malignant?

Some may continue to grow and transform into a malignant condition called chondrosarcoma in adulthood. Your child's doctor will pay close attention to any tumor that grows past skeletal maturity, especially those that produce new

The bones most at risk for malignant transformation are those most central in location.

For instance, tumors found in the pelvis or shoulder girdle have a higher tendency to transform than those found in the bones of the hands and feet, which almost never become malignant.