Skip Navigation

What is Fibrosarcoma?

  • A fibrosarcoma is a malignant (cancerous) tumor that originates in the connective fibrous tissue found at the ends of bones of the arm or legs, and then spreads to other surrounding soft tissues. Soft tissues include fat, muscles, tendons (bands of fiber that connect bones to muscle), nerves, joint tissue, blood vessels and other fibrous tissue. It most commonly affects either a lower leg or arm.

    There are generally two forms of fibrosarcoma:

    • Infantile or congenital fibrosarcoma: This type of tumor is the most common soft tissue sarcoma found in children under one year of age. It presents as a rapidly growing mass at birth or shortly after. This form of fibrosarcoma is usually slow-growing, and tends to be more benign than fibrosarcoma in older children, which behaves more like the type found in adults.
    • Adult form fibrosarcoma: The adult form of this disease can occur in older children and in adolescents, roughly between the ages of 10 and 15. It is more aggressive than the infantile form and generally involves more complex treatment.

    Fibrosarcoma treatment at Dana-Farber/Boston Children's

    Children with fibrosarcoma are treated through the Bone and Soft Tissue Tumor Program at Dana-Farber/Boston Children's Cancer and Blood Disorders Center. Our specialists — including pediatric oncologists, surgical oncologists and radiation oncologists — offer a level of expertise in all types of childhood sarcomas rarely seen at other pediatric cancer centers. We provide the full set of options that can be used to treat fibrosarcoma, and our specialists can help you determine which option is best for your child.

    Learn more about fibrosarcoma

    Find in-depth information on childhood fibrosarcoma on the Dana-Farber/Boston Children's website, including details on fibrosarcoma symptoms, diagnosis and treatment.