👉 Osteostraca, also known as osteosarcoma, is a type of bone tumor. It occurs when the bone cells grow out of their normal shape and become hard and dense. This can lead to bone loss and pain in the affected area. The cause of osteostraca is unknown but it has been linked to factors such as genetics, diet, and exposure to radiation. Treatment options for osteostraca include surgery, chemotherapy, and radiation therapy.