The vast majority of chondroblastomas are benign and are mostly curable after scraping or surgical excision. However, there are a few that appear benign histologically but develop recurrence, aggressive growth, or even metastasis to the lung after surgery, which can be called aggressive or malignant chondroblastoma. Chondroblastoma is most common in adolescents aged 10-20 years, mostly located in the osteoid of long tubular bones, and is often eccentric. Metastatic chondroblastoma of the lung has a tendency to heal spontaneously, has a good prognosis after surgical resection, and is different from the malignancy of metastases in general. However, there is no disease theory whether there is a primary malignant chondroblastoma, and some people regard clear cell chondrosarcoma as the malignant tumor corresponding to chondroblastoma.