Chronic sinusitis is now considered the most common chronic disease se
en in this country.(1) The infections are commonly polymicrobial and i
nclude aerobes and anaerobes.(2) Fungal sinusitis accounts for up to 1
0% of cases of chronic sinusitis, and the disease ranges from allergic
fungal sinusitis through fungus balls to invasive fungal sinus diseas
e.(3,4) We report the case of a 19-year-old black female with nasal ob
struction, clear rhinorrhea, and nasal polyps. She underwent endoscopi
c sinus surgery after medical management failed to eradicate her sympt
oms. Cultures from her paranasal sinuses grew S. commune, a mushroom,
a member of the Basidiomycetes. There have been four prior reports of
S. commune sinusitis described in the literature. Presented is a revie
w of the literature, a description of the histologic, mycologic, and r
adiologic findings and suggested treatment. The magnetic resonance ima
ging (MRI) findings are presented here for the first time.