Abstract:

Objective To explore the etiopathogenisis of the isolate oculomotor nerve palsy with MRl. Design Retrospective case series. Participants One hundred and twenty-three patients with isolate oculcmotor nerve palsy. Methods MRI of 123 patients with isolate oculotomor nerve palsy were analyzed retrospectively. The MRI features of lesions were observed. Main Outcome Measures MRI findings.  Results In 123 cases of isolate oculomotor nerve palsy, there were 87 cases (70.7%) with abnormal. In 87 cases with abnormalities, cavernous sinus lesions were found in 62 cases (71.2%) , including nonspecific inflammations in 45, aneurysms in 8, tumors in 6, carotid-cavernous fistulas in 2 and intracavernous internal carotid artery atherosclerosis in 1. There were 16 cases (18.4%) with brainstem lesions, including infarction in 15 and inflammations in 1. Five cases(5.7%) with cranio-orbital communicating lesions were found, including inflammations in 3 and tumors in 2. Lesions in or around the cisternal segment of the oculcmotor nerve were found in 4 cases, including tumors in 2 and inflammations in 2. Conclusion The MRI findings of oculomotor nerve palsy are various, however cavernous sinus lesions is popular. MRI is useful to find the causes of oculomotor nerve palsy and helpful to guide specific treatment.(Ophthalmol CHN, 2015, 24: 304-308)

Key words: oculomotor nerve palsy, magnetic resonance imaging