Abstract
Chronic sinusitis （CRS） is one of the most common nasal diseases, and FSDP is a risk factor for CRS. The variation of the frontal recess cell obstructs the frontal sinus drainage pathway, which makes the frontal sinus surgery more difficult and a higher recurrence rate than other sinus surgeries. Therefore, before surgery, a thin-slice CT scan is performed on the patient to fully evaluate the anatomical structure and drainage pathway of the frontal sinus, and to understand the variation of FSDP cell is crucial for accurate opening of the frontal sinus. In this paper, A case of large supra bulla frontal cell infection was summarized and analyzed. The anatomical structure of the frontal recess was fully understood by preoperative radiographs, the spatial relationship between the cells was identified, and the appropriate surgical plan was developed, which was beneficial for the surgeon to accurately open the frontal cortex during surgery and avoid postoperative recurrence.