Respiratory Compromise Related to Primary Histoplasmosis Infection in Two Pediatric Patients.

Primary infection related to the fungus, histoplasmosis, is generally asymptomatic in immunocompetent hosts. Calcified granulomas may be noted incidentally on radiologic imaging such as chest radiographs or computed tomography imaging. However, even in immunocompetent hosts, these primary infections occasionally result in end-organ involvement including respiratory compromise. Histoplasmosis should be included in the differential diagnosis of patients presenting with respiratory involvement and mediastinal adenopathy. We present two pediatric-aged patients who developed pulmonary involvement related to a primary histoplasmosis infection that resulted in mediastinal and tracheal lymphadenopathy. These led to respiratory compromise due to pleural effusion in the first patient and tracheal compression in the second. In this paper, the basic microbiology of Histoplasma capsulatum is presented, previous reports of primary respiratory involvement presented, and diagnostic and therapeutic options discussed.