Vasculitis of the gallbladder: case report and spectrum of disease.

Polyarteritis nodosa and microscopic polyangiitis involve small and medium-sized blood vessels. The majority of patients with microscopic polyangiitis have perinuclear antineutrophil cytoplasmic antibodies, usually antimyeloperoxidase (anti-MPO) antibodies. This report describes the first case of perinuclear antineutrophil cytoplasmic antibodies (p-ANCA) associated vasculitis presenting as, and manifesting predominantly with, cholecystitis.