Mycotic sinusitis.

In recent years, Extramucosal Fungal Sinusitis (EFS) in immunocompetent hosts have aroused increasing interest from both clinicians and pathologists. Histopathologically, they are characterized by the presence of fungal hyphae in the lumen of the sinus with no tissue invasion. They include two different entities: the mycetoma and the atopical fungal sinusitis (AFS).

Allergy and sinusitis.

Nasal allergy is statistically related to inflammatory chronic sinusitis as a risk factor. But one question still remains unanswered: are the reactions and modifications observed in the sinuses after natural exposure to a nasal allergen or after nasal allergen challenge linked to an IgE mediated mechanism? Similarities in symptoms, eosinophils and mediators of inflammation in the mucosa have been found between allergic rhinitis and sinusitis. The same applies for the deposition of Major Basic Protein (MBP) and treatment results, especially when topical steroids are found.