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.

论通过鼻内镜对额及周围解的观察，认为星状裂作为定的解标志是识别额的关键区域。筛泡前径路是鼻内镜下额放的安全入路，能避免其他径路存在的某些风险。