單獨外展神經麻痺—病例報告

Isolated Abducens Nerve Palsy: A Case Report

外展神經麻痺是最常見的眼外肌麻痺。外展神經從腦幹發出到支配外直肌，路徑很長，因此許多病因都可引起外展神經麻痺。非外傷性的單獨外展神經麻痺大多是因為供應外展神經幹的微血管缺血所引起。腦幹梗塞造成單獨外展神經麻痺很少見，因為外展神經周圍有許多神經結構。本文描述一位66歲男性病患主訴突發性複視，理學檢查發現右側單獨外展神經麻痺，腦部磁振造影顯示右邊橋腦延腦交界前外側有急性梗塞。病患複視症狀於一個月內完全改善。

Abducens nerve palsy is the most commonly encountered ocular motor nerve palsy. Because abducens nerve runs a long course from the brainstem to the lateral rectus muscle, abducens nerve palsy can result from numerous etiologies. The most common cause of non-traumatic isolated abducens nerve palsy is microvascular disease, which results from ischemia of the nerve trunk. Isolated ANP due to focal brainstem infarction is very rare because many neural structures are located near this nerve. We describe a 66-yearold man who suffered from acute diplopia. On examination, he demonstrated signs of right abducens nerve palsy. Magnetic resonance imaging showed acute infarction in right anteriolateral pontomedullary junction. His diplopia resolved in one month.