Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Enthesitis-related juvenile idiopathic arthritis ?
    ### Response:
    Enthesitis-related juvenile idiopathic arthritis is a subtype of juvenile idiopathic arthritis that is characterized by both arthritis and inflammation of an enthesitis site (the point at which a ligament, tendon, or joint capsule attaches to the bone). Signs and symptoms generally develop in late childhood or early adolescence and include pain, tenderness, and swelling in joints and at the enthesis.
    