Blastomycosis (Gilchrist Disease; North American Blastomycosis) By Sanjay G Revankar, MD, Wayne State University School of Medicine Reviewed / Revised Apr 2021 | Modified Sep 2022 View Patient Education Symptoms and Signs Diagnosis Treatment Key Points More Information Topic Resources Extrapulmonary Blastomycosis... Extrapulmonary Blastomycosis... Extrapulmonary Blastomycosis... Extrapulmonary Blastomycosis... Extrapulmonary Blastomycosis... Pulmonary Blastomycosis Blastomycosis is a pulmonary disease caused by inhaling spores of the dimorphic fungus Blastomyces dermatitidis.