Multiple mesenteric aneurysms complicating subacute bacterial endocarditis.

Multiple visceral aneurysms complicating periarteritis nodosa are considered characteristic, though not pathognomonic, on arteriography. This arteriographic pattern has been described with hairy-cell leukemia, collagen vascular disorders, and atrial myxoma, but, to our knowledge, has not been previously reported with subacute bacterial endocarditis. A patient with enterococcal endocarditis sustained separate intra-abdominal hemorrhages, 24 hours apart, from aneurysms of the middle colic and left colic arteries. Sterile vessel cultures with inflammatory infiltrates, decreased complement levels, positive rheumatoid factor, and arteriographic evidence of multiple visceral aneurysms suggest the vasculitis was immunologically mediated and not mycotic. Antibiotic therapy after control of hemorrhage controlled abdominal symptoms.