What is chondroblastoma?Sometimes called Codman's tumor, a chondroblastoma is a rare type of benign bone tumor that originates from cartilage. Cartilage is the specialized, gristly connective tissue that is present in adults and the tissue from which most bones develop. Cartilage plays an important role in the growth process. There are many different types of cartilage that are present throughout the body. Chondroblastoma most often affects the ends of the long bones in the arms and legs at the hip, shoulder, and knee.Chondroblastoma is a rare type of bone tumor that can affect people of all ages. It is, however, most common in children and young adults. This type of tumor is also more common in males than females.What causes chondroblastoma?The exact cause of chondroblastoma is not known. The tumors are believed to originate from immature cartilage producing cells called chondroblasts.Treatment for chondroblastoma:Specific treatment for chondroblastoma will be determined by your physician based on: * your age, overall health, and medical history * extent of the disease * your tolerance of specific medications, procedures, or therapies * expectations for the course of the disease * your opinion or preference