A rare species i.e. A. nidulans is reported as a causative agent of allergic fungal rhinosinusitis in this study. It is an increasingly recognized type of chronic recurring hypertrophic sinus disease. There are more than 185 species of aspergillus and over 95% of all infections are caused by A. fumigatus, A. flavus and A. niger. A. fumigatus alone accounts for the large majority of cases of both invasive and non invasive aspergillosis. A young immunocompetent lady presented with bilateral nasal obstruction due to multiple polypoid mass at Sheth Vadilal Sarabhai General Hospital, Ahmedabad. Provisional diagnosis of sinonasal polyposis possibly due to fungal cause with infiltration in to nasal cavity was made. Bilateral functional endoscopic sinus surgery with polypectomy was done. The specimen was examined by standard methods and the fungus was identified as A. nidulans by slide culture.
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