<prompt> The Most common cause of a Mycotic aneurysm isCandida albicansTreponema pallidumStaphylococcus aureusPseudomonas aeuriginosa  <response>: Primary infection of the aoic wall results in aneurysm formation termed mycotic aneurysms, the pathogens usually are bacteria, most common being Staphylococcus aureus, Staphylococcus epidermidis, Salmonella, and Streptococcus. ref - Harrisons internal medicine 20e pg1918 