高倍镜下可见肾动脉的一个分支有血管炎。这是坏死性肉芽肿性血管炎。本例，血清C-ANCA阳性，诊断为wegener肉芽肿。
At high power, the vasculitis is seen to involve a renal artery branch. This is a necrotizing granulomatous vasculitis. In this case, the C-ANCA serology was positive and a diagnosis of Wegener's granulomatosis was made.
