A. Antrochoanal Polyp
B. Allergic Nasal Polyposis
- Rhinosporidiosis is caused by a fungus, Rhinosporidium seeberi.
- Typically it occurs in a nasal polyp but may be found in other locations like nasopharynx, larynx and conjunctiva.
- The disease is common in India and Sri Lanka and sporadic in other parts of the world.
- Microscopically, besides the structure of inflammatory or allergic polyp, large number of organisms of the size of erythrocytes with chitinous wall are seen in the thickwalled sporangia.
- Each sporangium may contain a few thousand spores.
- On rupture of a sporangium, the spores are discharged into the submucosa or on to the surface of the mucosa.
- The intervening tissue consists of inflammatory granulation tissue (plasma cells, lymphocytes, histiocytes, neutrophils) while the overlying epithelium shows hyperplasia, focal thinning and occasional ulceration .