Tertiary syphilis is a rare, slowly progressive inflammatory disease that becomes clinically visible years after initial infection. Although it can affect any organ in the body, it shows a predilection for the cardiovascular and nervous systems. Today, however, cardiovascular syphilis is a medical curiosity because the disease can successfully be treated with antibiotics in its early phase. We present a case of a 43-year-old male patient with a syphilitic aneurysm of the descendent aorta and our choice of treatment.