Wegener's granulomatosis is a distinct clinicopathologic entity charac
terized by granulomatous vasculitis of the upper and lower respiratory
tract and kidneys. A 56-year-old Japanese man with Wegener's granulom
atosis died of intraperitoneal hemorrhage from a ruptured aneurysm of
his left gastric artery. Histological findings revealed necrotizing gr
anulomatous vasculitis involving this artery. No previously published
reports have described Wegener's granulomatosis patients with aneurysm
s in such a large artery. We conclude that this case represents either
an atypical form of Wegener's granulomatosis or a polyangiitis overla
p syndrome of Wegener's granulomatosis and classic polyarteritis nodos
a.