2022
DOI: 10.3390/brainsci12040451
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A Rare Neuro-Ophthalmological Condition in a Patient with Lung Adenocarcinoma: The Eight-and-a-Half Syndrome, Case Report and Review of the Literature

Abstract: The eight-and-a-half syndrome is a rare neuro-ophthalmological condition caused by a structural lesion in the dorsal portion of the pons, involving critical areas of the brainstem, i.e., medial longitudinal fasciculus (MLF), abducens nucleus, facial genu, and colliculus. It is characterized by internuclear ophthalmoplegia with horizontal gaze palsy and peripheral facial palsy. Although the syndrome is most frequently caused by vascular or demyelinating diseases, several different underlying causes might occur.… Show more

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“…Depending on the anatomical site affected, pathology in the brainstem can give rise to unique brainstem syndromes with specific localising signs, such as Foville, Weber or Wallenberg syndromes, and many more. These brainstem syndromes are most frequently caused by ischaemic stroke, but they have also been reported as secondary to infection and tumours 10 11. In our case, the patient’s symptoms do not point towards any specific brainstem syndromes, possibly due to pontomedullary involvement and a large area of cerebral oedema.…”
Section: Discussionmentioning
confidence: 43%
“…Depending on the anatomical site affected, pathology in the brainstem can give rise to unique brainstem syndromes with specific localising signs, such as Foville, Weber or Wallenberg syndromes, and many more. These brainstem syndromes are most frequently caused by ischaemic stroke, but they have also been reported as secondary to infection and tumours 10 11. In our case, the patient’s symptoms do not point towards any specific brainstem syndromes, possibly due to pontomedullary involvement and a large area of cerebral oedema.…”
Section: Discussionmentioning
confidence: 43%
“…Neuroimaging, such as MRI, may help identify a specific lesion site, such as lacunar infarction of the MLF ( Figure 3 ). Neuroimaging may also reveal intracranial tumors with mass effect (e.g., pseudo-INO via oculomotor palsy), or brainstem tumors or metastases disrupting ocular motor nuclei or the MLF directly ( 13 ).…”
Section: Discussionmentioning
confidence: 99%