👉 Chondroendothelioma is a type of cancer that occurs in the bone and cartilage. It is characterized by the growth of abnormal cells called chondrocytes, which are found throughout the body. In some cases, these cells can grow too quickly and cause pain or other symptoms. The exact cause of chondroendothelioma is not fully understood, but it is thought to be caused by an imbalance in the number and function of chondrocytes.