Enchondroma is one type of benign (noncancerous) cartilage tumor that appears on the inside of the bone. These tumors usually begin and grow in childhood, then stop growing but remain present throughout adulthood. They are often found in patients between 10 and 20 years of age. Some cases become dormant or burned out.
These tumors are very common and often occur in the small bones of the hand and feet. In fact, they are the most common tumor of the hand. They also occur in the long bones of the upper arm and thigh.
Image from museum.icp.org (writing on card digitally removed) link.
G.T. Williams & Bros.
Collection of the Mütter Museum of the College of Physicians of Philadelphia
The child above likely has a condition called Ollier Disease.Other similar posts