Abstract：
Pneumatisation of the maxillary sinus (MS) is variable. The archived cone-beam computed tomography file of a 54-year-old female was retrospectively evaluated anatomically. Nasal or retrobullar recesses of the MSs (NRMS) were found. The MSs were bicameral. NRMSs extended from the postero-lateral chambers of the MSs into the lateral nasal walls. The right NRMS was reached superior to the middle turbinate and the ethmoidal bulla was applied on its anterior side. The left NRMS had two medial pouch-like ends, one beneath the ethmoidal bulla and the other on the anterior side of the basal lamella of the middle turbinate. Additional anatomical findings were the uncinate bulla, infraorbital recesses of the MS, maxillary recess of the sphenoidal sinus, and atypical posterior insertions of the superior nasal turbinates, maxillo-ethmoido-sphenoidal and ethmoido-sphenoidal. The NRMS is a novel finding and could lead to erroneous endoscopic corridors if not documented before the interventions.
摘要：
上颌窦（MS）的气动是可变的。对54岁女性的存档锥形束计算机断层扫描文件进行了回顾性解剖学评估。发现了MS（NRMS）的鼻或后凹处。MS是两院制的。NRMS从MS的后侧室延伸到侧鼻壁。右侧NRMS位于中鼻甲上方，筛骨大疱位于其前侧。左侧NRMS有两个内侧袋状末端，一个在筛骨大疱下面，另一个在中鼻甲的基底层的前侧。其他解剖学发现是钩骨大疱，MS的轨道下凹陷，蝶窦上颌隐窝,和上鼻甲的非典型后插入，上颌-筛骨-蝶骨和筛骨-蝶骨。NRMS是一个新发现，如果在干预之前没有记录，可能会导致错误的内窥镜通道。
