Blastomyces species and orbital apex syndrome: Unsuspected co-infection.

Blastomyces species are thermally dimorphic fungi existing as yeast in tissue. We report an initially immunocompetent patient with orbital apex syndrome (OAS) whose presentation suggested giant cell arteritis. Subsequently, metastatic carcinoma was entertained as a cause of OAS until bronchoscopy yielded Blastomyces species. The patient rapidly succumbed with multiorgan failure despite Amphotericin B administration. At post-mortem, Blastomyces co-infection with fungal hyphae in keeping with Aspergillus species was found in cavernous sinus and in infarcted optic nerve. To the best of our knowledge, co-infection with these two organisms in this clinical setting has not been reported.