An atypical presentation of colonic malignancy: Clostridium septicum aortitis.

Clostridium septicum (CS) is a rare organism that accounts for only 1.3% of all clostridial infections. However, its detection is of great clinical significance, as over 80% of cases are associated with malignancy, often occult; the most common primary sites are the ascending colon and caecum, and the most common cause is haematological malignancy.