Mycotic aneurysm of the internal iliac artery caused by Klebsiella pneumoniae.

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 from arterial blood. An extra-anatomic bypass (left external iliac artery to right common femoral artery) was performed with a successful excision of the aneurysm.