Abstract
Objective To analyze the diseases responsible for ophthalmoplegia and determine the optimal technique identifying the lesions. Methods CT and MR imaging findings of 1376 patients with ophthalmoplegia were analyzed. The total positive rate and ratio of the diseases causing ophthalmoplegia were calculated. The efficiency of various methods and sequences was compared in the evaluation of cavernous sinus inflammation and other lesions. Multi-paired samples Friedman test was used to compare five kinds of images from different methods and sequences, and Wilcoxon test was used to compare between every two kinds of images. Results The total positive rate was 91.9% (1264/1376). In 50 patients who underwent both CT and MRI, the positive rate of MRI (92. 0% ,46/50) was higher than that of CT (48.0% ,24/50)(Z = -4. 8, P ＜ 0. 01). There were 552 cases (43.7%) of cavernous sinus lesions, 518 cases (41.0%)of extraocular muscle diseases, 108 cases (8. 5%) of cranio-orbital communicating lesions and 86 patients (6. 8%) of other lesions. The five kinds of images from various methods and sequences had significant difference in the detection of 283 cavernous sinus inflammation (χ2 = 1047. 1, P ＜ 0. 01) cases. Transverse T1WI with thin slice thickness[(2. 71 ± 0. 69)scores]was better than that with thick slice thickness [(1.67 ± 0. 64) scores], contrast transverse T1 WI with thin slice thickness[(3.92 ± 0. 27) scores]was better than transverse T2WI with thick slice thickness, transverse T1WI and coronal T1 WI with thin slice thickness[(3. 10 ± 0. 39) scores]. Coronal T1 WI with thin slice thickness was better than transverse T1 WI with thin slice thickness and transverse T2WI, and the contrast coronal T1WI with thin slice thickness [(3.95 ± 0. 22) scores]was better than transverse T, WI with thin slice thickness, transverse T2 WI and coronal T1WI (P ＜0. 01 separately). The positive rate of enhanced MRI (100% ,39/39) was higher than that of nonenhanced MRI (82. 1% ,32/39) (Z = - 2. 1, P ＜ 0. 05). Conclusion CT and MRI can show the lesions responsible for ophthalmoplegia. MRI is the best examination method in displaying these lesions. Key words: Ophthalmoplegia; Magnetic resonance imaging; Tomography, X-ray computed
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