Bone cyst is not cancer, it is a kind of tumor-like proliferative lesion, which is divided into different pathological types, as follows: 1. Simple bone cyst: also known as isolated bone cyst, it is one of the more common tumor-like lesions in the bone. It is mostly found in males aged 11-20 years old, and the most common sites are humerus and proximal femur, distal radius and proximal tibia can also occur. It is usually treated by surgical scraping and bone grafting, but the recurrence rate is high, up to 20%-50%; 2, aneurysmal bone cyst: it is a relatively rare intraosseous tumor-like lesion, which occurs in the age of 10-30 years old people, more females than males, and half of it occurs in the long bones of limbs, and it is usually treated by surgical scraping or local amputation, and the recurrence rate of surgical scraping is high, up to 20%-50%, and local amputation can reduce the recurrence rate; 3, adjacent joints. Bone cysts in neighboring joints: also known as intraosseous tendon sheath cysts, rare, occurring in the acetabulum, upper and lower ends of the tibia, lower end of the femur adjacent to the joints and other parts of the joints, usually scraping bone grafting treatment, with a good prognosis. Therefore, bone cyst is not cancer, patients do not need to worry too much, active treatment, respect the medical advice, the prognosis is better.