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.

结论通过鼻内窦开口及周围解剖结构的观察，认为星状裂作为定的解剖标志是识别窦开口的关键区域。筛泡路是鼻内下窦开放的安全入路，能避免其他路存在的某些风险。