Mediastinal Actinomycosis After Esophagogastroduodenoscopy.

Actinomycosis is an uncommon bacterial infection that presents as an indolent, progressive disease that can affect multiple organ systems. We describe the case of a 66-year-old female with end-stage renal disease who presented to the emergency department after developing acute dyspnea and chest pain two weeks after undergoing a diagnostic esophagogastroduodenoscopy (EGD). A CT scan was obtained that revealed a large mediastinal mass, which was initially concerning for a potential malignancy.