Disseminated Histoplasmosis: A Rare Cause of Pancytopenia in an Immunocompromised Patient.

is a dimorphic fungus endemic to North and South America. This organism's ubiquity outside the traditionally defined region of the Mississippi and Ohio River Valley makes it an important yet often forgotten cause of systemic inflammatory disease. Progressive disseminated histoplasmosis is an uncommon opportunistic infection, largely affecting immunocompromised individuals with defects in T-cell immunity.