Rana Khizar, Juniat Valerie, Rayan Aaron, Patel Sandy, Selva Dinesh
Department of Ophthalmology and Visual Sciences, University of Adelaide, North Terrace, Adelaide, SA, 5000, Australia.
South Australian Institute of Ophthalmology, Royal Adelaide Hospital, Port Road, Adelaide, SA, 5000, Australia.
Surg Radiol Anat. 2022 Apr;44(4):521-525. doi: 10.1007/s00276-022-02915-w. Epub 2022 Mar 8.
Normative oblique muscle data may help to diagnose pathological enlargement of the oblique muscles. We aim to describe the normative values of the superior and inferior oblique muscles in an Australian cohort on T1-weighted MRI and fat suppressed contrast enhanced T1-weighted MRI.
A retrospective review of patients who underwent 3 T orbital MRI. The healthy orbits were used to conduct measurements in patients with a unilateral orbital lesion. The maximum diameters of the superior and inferior oblique muscles were measured on coronal planes. The diameter was measured perpendicular to the long axis of the muscles.
The normal measurements (mean ± SD) on fat suppressed contrast enhanced T1-weighted MRI: superior oblique, 3.0 ± 0.5 mm and inferior oblique, 2.7 ± 0.5 mm. On T1-weighted MRI: superior oblique, 2.8 ± 0.5 mm and inferior oblique, 2.5 ± 0.4 mm. In patients who had both sequences performed, the superior and inferior oblique diameters were significantly higher on the fat suppressed contrast-enhanced T1-weighted MRI than the T1-weighted MRI sequence (p < 0.01).
Oblique muscle enlargement may be seen in a range of orbital diseases. These data may help in diagnosing oblique muscle enlargement. In addition, variations in the measured muscle diameters can be seen according to the scan sequence that is used.
规范的眼外肌数据可能有助于诊断眼外肌的病理性增大。我们旨在描述澳大利亚队列中在T1加权磁共振成像（MRI）和脂肪抑制对比增强T1加权MRI上的上、下斜肌的规范值。
对接受3T眼眶MRI检查的患者进行回顾性研究。使用健康眼眶对单侧眼眶病变患者进行测量。在冠状面上测量上、下斜肌的最大直径。直径测量垂直于肌肉的长轴。
在脂肪抑制对比增强T1加权MRI上的正常测量值（均值±标准差）：上斜肌，3.0±0.5mm；下斜肌，2.7±0.5mm。在T1加权MRI上：上斜肌，2.8±0.5mm；下斜肌，2.5±0.4mm。在同时进行两种序列检查的患者中，脂肪抑制对比增强T1加权MRI上的上、下斜肌直径显著高于T1加权MRI序列（p<0.01）。
在一系列眼眶疾病中可能会出现眼外肌增大。这些数据可能有助于诊断眼外肌增大。此外，根据所使用的扫描序列，测量的肌肉直径会有所变化。
