Stjernholm Christina, Muren Catharina
Department of Radiology, Stockholm Söder Hospital, Karolinska Institutet, Stockholm, Sweden.
Acta Otolaryngol. 2002 Jan;122(1):43-8. doi: 10.1080/00016480252775724.
The purpose of this study was to determine the normal variations of cochlear nerve canal dimensions, which is useful information to have when assessing congenital malformations, i.e. during the preoperative evaluation of cochlear implant candidates. The length and diameter of the cochlear nerve canal were measured in 117 casts from randomly selected temporal bone specimens obtained from the Uppsala Temporal Bone Laboratory. In 16 of the casts the dimensions were correlated with those obtained from CT scans of the same temporal bone. Measurements were also made from CT examinations of the temporal bone of 50 patients referred for evaluation of cholesteatoma or chronic otitis media. The mean length and diameter in the axiopetrosal plane measured in casts were 1.17 and 2.58 mm, respectively. The mean diameter in the axial plane was 2.59 mm. The mean length and diameter determined from CT scans of the specimens were 1.19 and 1.98 mm, respectively. The mean length and diameter determined from CT examinations of patients were 1.08 and 1.91 mm, respectively. In conclusion, the cochlear nerve canal is short, with a circular cross-section. If the diameter of the canal is < 1.4 mm then the possibility of cochlear nerve abnormality should be considered; if it is > 3.0 mm then other anomalies may coexist.
本研究的目的是确定耳蜗神经管尺寸的正常变异情况，这在评估先天性畸形时，即在对人工耳蜗植入候选者进行术前评估时，是有用的信息。从乌普萨拉颞骨实验室随机选取的颞骨标本制作的117个铸型中测量了耳蜗神经管的长度和直径。在16个铸型中，将这些尺寸与同一颞骨CT扫描获得的尺寸进行了关联。还对50例因胆脂瘤或慢性中耳炎前来评估的患者的颞骨进行了CT检查并测量。铸型中在轴位岩骨平面测量的平均长度和直径分别为1.17和2.58毫米。轴位平面的平均直径为2.59毫米。从标本的CT扫描确定的平均长度和直径分别为1.19和1.98毫米。从患者的CT检查确定的平均长度和直径分别为1.08和1.91毫米。总之，耳蜗神经管短，横截面为圆形。如果神经管直径<1.4毫米，则应考虑耳蜗神经异常的可能性；如果直径>3.0毫米，则可能并存其他异常。
