A rare presentation of empyema necessitatis

Rare Escherichia coli Empyema Necessitating to Pelvic Retroperitoneum With Extension to the Groin

Empyema necessitans is a rare form of infection that spreads to the soft tissue of visceral organs. In the case of thoracic empyema, the infection can spread to the parietal pleura of the lungs. This can cause many complications as treatment is more complicated with the spread of this infection. Escherichia coli (E. coli) is a rare occurrence of this infection, and understanding its role in the community and the implications of its survival in extraintestinal environments can be beneficial for the treatment of these cases.

Aggregatibacter actinomycetemcomitans Causing Empyema Necessitans and Pyomyositis in an Immunocompetent Patient

Empyema necessitans is a relatively rare clinical entity in which the empyema extends through the parietal pleura into the adjacent soft tissue and musculature of the chest wall. It usually occurs due to inadequate treatment of a primary lung infection. Aggregatibacter (formerly Actinobacillus) actinomycetemcomitans is a facultative anaerobic gram-negative coccobacillus that is part of the normal oral flora. Infections due to this organism usually result from aspiration in conjunction with dental disease or trauma to the oral mucosa resulting in pneumonia or empyema. It often coinfects with Actinomyces and is known to cause empyema necessitans. Cases of monomicrobial empyema necessitans due to Aggregatibacter actinomycetemcomitans in adults have rarely been reported with four such publications found on review of the literature. We present a patient with severe periodontitis who developed empyema necessitans due to Aggregatibacter actinomycetemcomitans likely from aspiration complicated by pyomyositis of the right triceps brachii and a left posterior thigh abscess.