An Unusual Case of Pulmonary Cryptococcus

Abstract

Cryptococcal infections are caused by encapsulated fungi Cryptococcus gattii and C. neoformans. Inhalation commonly causes innocuous colonization but may cause meningitis or disseminated disease via hematogenous spread. Cryptococcosis occurs most commonly in immunocompromised patients including those with acquired immunodeficiency syndrome, meningoencephalitis or disseminated disease. However, cryptococcosis can occur as asymptomatic isolated pulmonary nodules in immunocompetent patients. Here we present a unique retrospective case report of a 55-year-old immunocompetent man who presented with pleuritic chest pain, productive cough, dyspnea on exertion, chills, night sweats, and weight loss. A computed tomography scan of his chest revealed multiple ground-glass opacities throughout both lung fields. The results of his autoimmune evaluation and human immunodeficiency virus tests were negative. A biopsy obtained through video-assisted thoracoscopic surgery revealed mucicarmine staining capsules confirming Cryptococcus, requiring treatment with amphotericin, flucytosine, and fluconazole. This case highlights the rarely studied presentation of symptomatic diffuse pulmonary cryptococcal infection in an immunocompetent patient requiring treatment.

Keywords: cryptococcosis; immunocompetent patient; pulmonary involvement.

Figure 1. Pulmonary nodule: 18 mm (initial presentation)

Figure 2. After three months: chest CT showing bilateral ground-glass opacities involving all lung lobes; the largest measured 5.7 cm in diameter

CT - computed tomography