<prompt> Most common cause of fungal sinusitis isA. fumigatusA nigerA flavusCandida  <response>: Commonest cause of fungal sinusitis is Aspergillus fumigatusOther causes Non-invasive form - A.niger, A.flavus, CandidaNon-invasive fungal sinusitis presents as a fungal ball or allergic fungal rhinosinusitis AFRSRef: Hazarika; 3rd ed; Pg 338 