Abstract: Objective The aim of this study is to the clinical features of fungal spheroid fungal sinusitis and osteitis. Methods The clinical data of 105 FBS patients (110 sinuses in total) were retrospectively analyzed,the clinical features of their symptoms, signs, image, pathology, and osteitis were summarized and analyzed. Results Among the 110 sinuses, 97 sinuses (88.2%) were located in the maxillary sinus, and 13 sinuses (11.8%) were located in the sphenoid sinus; 97 sinuses (88.2%) had different degrees of bone thickening compared with the contralateral sinus. The wall bone of lesion sinus and contralateral sinus were significantly different in bone thickness (0.34±0.17 vs. 0.14±0.08), CT value (1161.5±322.5 vs. 864.2±482.8), GOSS score (3.0±1.4 vs. 0.3±0.9) .Pathological observation showed manifestations of osteomyelitis accompanied by bone remodeling activities. Conclusion Fungal spheroid fungal sinusitis prefer to occurs in the maxillary sinus and sphenoid sinus, mainly in single sinus. Most of the wall bone around the lesion sinuses have obvious osteitis, which is mainly characterized by bone thickening and increased CT value.

Key words: fungal ball, fungal sinusitis, osteitis