Pathogenesis of all of the following is granulomatous, except: (A) Wegener’s granulomatosis, (B) Microscopic polyangiitis, (C) Takayasu’s arteritis, (D) Buerger’s disease
Answer is B. Robbins clearly mentions that “microscopic polyangiitis is characterized by segmental fibrinoid necrosis of the media with focal transmural necrotizing lesions; granulomatous inflammation is absent”.