Primary chest wall abscess caused by Escherichia coli costochondritis.

Chest wall abscess may occur as primary infection or secondary to open trauma or thoracic wall surgery. The authors describe an unusual case of Escherichia coli costochondritis occurring 2 months after a blunt chest wall trauma. Primary chest wall abscess due to E coli costochondritis has been previously reported only twice occurring after urinary tract infection. All other very few reports of E coli costochondritis have been reported only after thoracic surgical procedures. An English literature review of primary chest wall abscess showed that 4 pathogens are responsible for the majority of cases: Actinomyces, Staphylococcus aureus, Candida albicans and Salmonella. C albicans costochondritis was most commonly reported among heroin addicts. The appearance of a growing chest wall mass should always prompt a search for an infectious cause, even with little or no systemic signs and symptoms.