There were statistical differences between the adult group and the pediatric group in ethmoid bulla hypertrophy and middle nasal concha etherealization.

筛泡肥大和中甲气化的出现率在成年组和未成年组差异有统计学意义。

Performation of surgical procedures anterior to ethmoid bulla can avoid risks of the other models, therefore, endoscopic frontal sinusotomy in the route anterior to ethmoid bulla is a safe model.

结论内镜对额开口及周结构的观察，认为星状裂作为恒定的标志是识别额开口的关键区域。筛泡前径路是内镜下额开放的安全入路，能避免其他径路存在的某些风险。