Asaumi Rieko, Kawai Taisuke, Kawata Shinichi, Omotehara Takuya, Kondo Shintaro, Itoh Masahiro
Department of Oral and Maxillofacial Radiology, School of Life Dentistry at Tokyo, The Nippon Dental University, Chiyoda-ku, Tokyo, Japan.
Department of Anatomy, Tokyo Medical University, Shinjuku-ku, Tokyo, Japan.
J Int Adv Otol. 2021 Mar;17(2):134-144. doi: 10.5152/JIAO.2021.0058.
Anatomical information regarding the eustachian tube (ET) is limited; therefore, more detailed analytical data on ET structure is needed when planning surgical treatments involving the temporal bone.
We examined the bony structure of the middle ear and ET in 30 Japanese donor cadavers (71-97 years old at the time of death) both macroscopically and with cone-beam computed tomography. Each ET was reconstructed in 3 dimensions, and the structure and correlations of ET element measurements, identified via principal component analysis, were analyzed.
Delineation between bony and cartilaginous zones appeared unclear, and the space between ET cartilage and the carotid canal was narrow. We observed stenosis of the ET bony canal in 43.3% of the specimens (n = 30). In 50% of the specimens, the position of the ET bony canal was depressed at the pharyngeal orifice of the auditory side of the tube, and the middle region was a roundish structure. The lateral and central regions of the bony canal were related to the ET bony canal structure.
The close proximity of the ET bony canal to the carotid canal is an important anatomical and morphological finding. Pre-surgical 3D modeling of the middle ear structure, or at a minimum, of the central region of the middle ear canal, may provide useful information for planning procedures that involve the ET.
关于咽鼓管（ET）的解剖学信息有限；因此，在规划涉及颞骨的外科治疗时，需要更详细的ET结构分析数据。
我们对30具日本捐赠者尸体（死亡时年龄71 - 97岁）的中耳和ET的骨结构进行了宏观和锥形束计算机断层扫描检查。对每个ET进行三维重建，并分析通过主成分分析确定的ET元素测量的结构和相关性。
骨区和软骨区之间的界限似乎不清晰，ET软骨与颈动脉管之间的间隙狭窄。我们在43.3%的标本（n = 30）中观察到ET骨管狭窄。在50%的标本中，ET骨管在管听觉侧的咽口处位置凹陷，中间区域为圆形结构。骨管的外侧和中央区域与ET骨管结构有关。
ET骨管与颈动脉管紧密相邻是一项重要的解剖学和形态学发现。中耳结构的术前三维建模，或者至少是中耳管中央区域的三维建模，可能为规划涉及ET的手术提供有用信息。
