Osteosarcoma is a type of malignant tumor that occurs in the bones, generally classified as stage IIb. Common sites for osteosarcoma include the distal part of the bone, the proximal tibia, and the proximal humerus. It most commonly affects adolescents.

Clinically, it primarily presents as persistent pain, including nighttime pain. Swelling and limited joint function typically occur around the common sites. Additionally, there are general symptoms associated with cachexia, such as malnutrition, anemia, mild or high fever, or weight loss.

Fourthly, it is very prone to causing pathological fractures. Many osteosarcoma patients seek medical attention due to these fractures. Thus, osteosarcoma is a serious malignancy in the bones with a generally poor prognosis. Diagnosis and treatment of osteosarcoma are crucial; upon confirmation, timely treatment is necessary. The primary treatment approach is a combination therapy centered around surgery, typically involving preoperative chemotherapy, followed by surgical treatment and postoperative chemotherapy. Currently, the five-year survival rate for osteosarcoma has significantly improved, reaching approximately 70% to over 80%.