Figure 1. A) Section of nasal mucosa showing multifocal hyperplasia, juvenile sporangia (arrows) within the mucosal epithelium (1) and the lamina propria mucosae (2), and mature sporangia (arrowhead). A multifocal mixed inflammatory infiltrate can be seen within the mucosa. Stain, hematoxylin and eosin; magnification ×4; scale bar, 250 μm. B) Semithin section of nasal mucosa with juvenile sporangia (arrowheads) and a mature sporangium (arrow) with a lymphoplasmacellular inflammatory infiltrate within the lamina propria mucosae. Stain, toluidine blue; magnification ×10; scale bar, 40 μm.