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.

结论通过鼻内镜对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口的关键区域。径路是鼻内镜下放的安全入路，能避免其他径路存在的某些风险。