Definition: Lipomyxoma is a type of bone tumor that occurs in the soft tissues of the bones, including the cartilage and fat. These tumors can grow rapidly and can spread to other areas of the body. They are typically found in adults but can also occur in children. The most common cause of lipomyxoma is a rare genetic disorder called Turner syndrome, which causes an abnormality in the production of sex hormones. Lipomyxomas can be either benign or malignant, depending on