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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which vasculitis affects both aerial and venous system?
assistant
The correct answer is  Polyangiitis With Granulomatosis Previously called Wegener granulomatosis, this autoim- mune disease most often involves the upper respiratory tract and/or the lungs, with hemoptysis being the commonit is enough to emphasize that a transbronchial lung biopsy might provide the only tissue available for diagnosis. Since the amount of tissue is small, necrosis and granulomatous vasculitis might not be present. Rather, the diagnostically impoant features are capillaritis and scat- tered, poorly formed granulomas (unlike those of sarcoid- osis, which are rounded and well-defined).