Fig. 1.

Fungal ball a low power appearance of a maxillary sinus fungal ball from a 60 yo female. Fungal ball is composed of an entangled mass of fungal organisms (Hematoxylin and eosin; original magnification ×10). b Low power of a fungal ball showing a lamellated appearance, which can be confused with eosinophilic (allergic) mucin (EM). This fungal ball shows a layered appearance and pigmented fungal forms. Cultures grew Aspergillus niger (Hematoxylin and eosin; original magnification ×25). c Higher power of fungal ball showing an entangled mass of fungal organisms with very little inflammation (Hematoxylin and eosin; original magnification ×50). d Silver stain highlighting fungal organisms in a fungal ball (Grocott stain; original magnification ×100)