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目的:探讨基于10 μm级耳科专用CT的慢性中耳炎（COM）锤骨空间位置改变。方法:回顾性收集2020年10月至2021年3月在首都医科大学附属北京友谊医院放射科使用10 μm级耳科专用CT检查的COM患者（COM组）45例（45侧）资料，其中男20例，女25例，年龄20~78（40±14）岁；同期收集无外、中耳病变者（对照组）55例（89侧），其中男29例，女26例，年龄19~57（32±11）岁。测量并分析比较两组间锤骨头与上壁最短距离、锤骨颈外缘与鼓室盾板连线距离、锤骨颈外缘与鼓膜松弛部垂直距离、锤骨头与前壁最短距离、锤骨前突与前外侧壁最短距离、锤骨柄末端与鼓岬最短距离、锤骨头与面神经鼓室段最短距离。结果:与对照组相比，COM组锤骨头与上壁最短距离［n M（n Q1，n Q3）］［0.81（0.48，1.21）mm比0.57（0.33，0.90）mm］、锤骨颈外缘与鼓室盾板连线距离［1.79（1.54，2.13）mm比1.65（1.48，1.83）mm］增大（均n P<0.05）；锤骨颈外缘与鼓膜松弛部垂直距离［1.32（1.15，1.49）mm比1.45（1.31，1.59）mm］、锤骨柄末端与鼓岬最短距离［1.56（1.33，2.09）mm比2.10（1.74，2.43）mm］减小（均n P<0.05）。COM组左侧锤骨颈外缘与鼓膜松弛部垂直距离较右侧增大［1.39（1.19，1.51）mm比1.21（0.87，1.31）mm，n P<0.05］。n 结论:COM患者的锤骨相对位置关系存在变化，此变化有助于对COM影像学表现进一步认识。“,”Objective:To assess the changes of the spatial location of the malleus in patients with chronic otitis media (COM) using 10 μm otology CT.Methods:Forty-five patients with COM (COM group, 45 ears) and 55 patients without external and middle ear disease (control group, 89 ears), who underwent 10 μm otology CT examination in Department of Radiology, Beijing Friendship Hospital, Capital Medical University from October 2020 to March 2021, were retrospectively collected during the same period. In the COM group, there are 20 males and 25 females, aged from 20 to 78 (40±14) years. In the control group, 29 were males and 26 were females, with age of 19 to 57 (32±11) years. The shortest distance between the malleus head and the upper wall, the distance between the outer edge of the malleus neck and the scutum, the distance between the outer edge of the malleus neck and the pars flaccida of the tympanic membrane, the shortest distance between the malleus head and the anterior wall, the shortest distance between the anterior process and the anterolateral wall, the shortest distance between the tip of the malleus handle and the promontory, and the shortest distance between the malleus head and the tympanic segment of the facial nerve were measured and compared between the two groups.Results:Compared with the control group, the head-upper wall distance (n M (n Qn 1, n Qn 3)) (0.81 (0.48, 1.21) mm vs 0.57 (0.33, 0.90) mm) and the neck-scutum distance (1.79 (1.54, 2.13) mm vs 1.65 (1.48, 1.83) mm) were larger in the COM group (all n P<0.05), and the neck-tympanic membrane distance (1.32 (1.15, 1.49) mm vs 1.45 (1.31, 1.59) mm) and the handle-promontory distance (1.56 (1.33, 2.09) mm vs 2.10 (1.74, 2.43) mm) were reduced in the COM group (alln P<0.05, respectively). The neck-tympanic membrane distance on the left was larger than those on the right in the COM group (1.39 (1.19, 1.51) mm vs 1.21 (0.87, 1.31) mm,n P<0.05).n Conclusion:There are changes in the relative position of the malleus in patients with COM, which are helpful for further understanding the imaging manifestations in patients with COM.