As the name implies, osteochondroma is a raised swelling that occurs on the surface of the bone. In clinical terms, osteochondroma refers to osteochondromatosis, in which the tumor grows on the surface of the bone and protrudes outward, also known as exophytic osteochondroma. Osteochondroma is a benign bone tumor that occurs mostly in children and adolescents, and the most common sites are the distal femur and the proximal tibia. The clinical manifestation of osteochondroma is that it is a hard mass that can be touched locally, and there is no pain or pressure. If the tumor increases and presses the local nerves and blood vessels, compression symptoms may appear. Osteochondroma can be seen as a single or multiple occurrence in the metaphysis of bone on X-ray, and single occurrence is more common, and it is rarely malignant. Multiple tumors have hereditary tendency, and the chance of malignant transformation is higher than that of single tumors, which is also relatively rare. If the tumor has no obvious symptoms, it can be observed continuously, and surgical resection can be a radical cure.