As the entity is gaining recognition, reports of its incidence are increasing. Most series of AFS reports are from medical centers in the southern United States. A warm humid climate may enhance fungal growth and amplify disease prevalence. Mycology Most common etiologic agent in ABPA is Aspergillus. Atopic host 2.
Color ranges from light green to dark brown.
If allergic mucin with hyphal element is seen, the diagnosis of AFS can be made. However, fungal elements in AFS are relatively scarce and do not dominate the histologic specimen as in mycetoma. The surgical specimen must be analyzed promptly as the scant fungal elements deteriorate in vitro. The morphology of various fungi is similar on tissue examination, therefore fungal cultures must be obtained. The absence of fungal invasion in to removed mucosa and bone is necessary to rule out invasive fungal sinusitis.