Mycotic aneurysms are rarely caused by Klebsiella species. We describe
a male patient with diabetes mellitus and alcoholism who developed a
mycotic aneurysm of the right internal iliac artery complicated by the
formation of a false aneurysm. Klebsiella pneumoniae was cultured fro
m arterial blood. An extra-anatomic bypass (left external iliac artery
to right common femoral artery) was performed with a successful excis
ion of the aneurysm.