严重的上颌骨骨折,尤其是高位横断性骨折,多为Lefort Ⅲ型骨折,即骨折线横过鼻梁,眶部,经颧骨上方向后达翼突,形成完全的颅面分离。常伴有颅脑损伤,颅底骨折及脑脊液耳鼻漏。因上颌骨后部有翼内肌和翼外肌 Serious maxillary fractures, especially high transverse fractures, mostly Lefort type Ⅲ fracture, that is, the fracture line across the bridge of the nose, orbital, through the zygomatic up after the wing process, the formation of complete craniofacial separation. Often accompanied by brain injury, skull fracture and cerebrospinal fluid rhinorrhea. Due to the posterior maxilla medial wing and wing muscle