A giant syphilitic aneurysm in a young human immunodeficiency virus sero-positive individual.

A 35-year-old, human immunodeficiency virus sero-positive male presented with huge mediastinal mass for evaluation. After contrast enhanced computed tomography (CECT) angiogram, aneurysm of arch of aorta was diagnosed. The patient also proved to be co-infected with syphilis, which is the aetiological cause of aneurysm in this case. The present report highlights the need to suspect, diagnose and treat dual infections in individuals with high risk behaviour.