👉 In medicine, an extramedullary is a type of bone that grows outside the vertebral column. These bones are called "extramelia" and are found in many different parts of the body, including the spine, hip joint, and fingers. The term "extramedullary" refers to the fact that these bones can grow outside the normal length of the vertebrae, which is why they are sometimes referred to as "extra". This means that the bone will not fit perfectly