Wall-eyed bilateral internuclear ophthalmoplegia (WEBINO) syndrome secondary to dorsal pontine infarction.

Background: Wall-eyed bilateral internuclear ophthalmoplegia (WEBINO) is an uncommon ocular motor disorder which is featured by binocular exotropia and bilateral internuclear ophthalmoplegia. Methods: A 71-year-old man with hypertension presented to the emergency department with sudden-onset diplopia. Neurological examination, neuroimaging, blood and cerebrospinal fluid (CSF) testing were performed. Results: We presented a typical WEBINO syndrome case with a clear dorsal pontine infarction involving bilateral medial longitudinal fasciculi (MLF) on brain MR scan. The patient's eye movement abnormalities improved and MR lesions disappeared at 60-day follow-up after treatment of clopidogrel and atorvastatin. Furthermore, we summarised the aetiology and pathophysiology of WEBINO by retrospectively analysing all published WEBINO cases. We found that WEBINO can result from various underlying pathologies, with inflammation most common in the young, and stroke most common in the elderly. Simultaneous lesions of bilateral MLF definitely contribute to the pathophysiology of WEBINO. Conclusions: This case underscores the importance of early recognising WEBINO in the emergency department. A timely diagnosis of stroke-induced WEBINO is important so that acute treatment can be considered and for initiating secondary stroke preventive measures to potentially improve the prognosis.