Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) granulomatosis with polyangiitis ?
    ### Response:
    Granulomatosis with polyangiitis (GPA) is a condition that causes inflammation that primarily affects the respiratory tract (including the lungs and airways) and the kidneys. This disorder is also commonly known as Wegener granulomatosis. A characteristic feature of GPA is inflammation of blood vessels (vasculitis), particularly the small- and medium-sized blood vessels in the lungs, nose, sinuses, windpipe, and kidneys, although vessels in any organ can be involved.
    