What are etiologies of pulmonary vasculitis?

Occurs in 1ary systemic vasculitis, SLE, polymyositis, lymphoma, sarcoidosis, extrinsic allergic alveolitis. 1ary vasculitis processes: giant cell arthritis, pulmonary capillaritis, takayaso arteritis, circulating Ab to neutrophils (Churg-strauss, Wegner, polyangiitis)