Occipital lobe infarction caused by tentorial herniation

Area of Science:

• Neurology
• Radiology
• Neuroimaging

Background:

• Tentorial herniation is a critical condition involving the downward displacement of brain structures through the tentorium cerebelli.
• Occipital lobe infarction, a type of stroke, can occur secondary to mass effect and compromised blood flow.
• Computed tomography (CT) is a key imaging modality for diagnosing brain herniation and infarction.

Observation:

• This study analyzed CT findings in nine patients with occipital lobe infarction secondary to tentorial herniation.
• The extent of occipital lobe involvement varied, with complete infarction in five patients and partial infarction in the remaining four.
• Associated infarctions in other brain regions were observed in four patients.

Findings:

• Tentorial herniation can lead to occipital lobe infarction, with varying degrees of parenchymal involvement.
• Infarction beyond the ipsilateral occipital lobe was noted in the ipsilateral posterior limb of the internal capsule, contralateral Ammon's horn, and contralateral occipital lobes.
• Hemorrhagic infarction was identified in two of the nine patients, indicating a more severe ischemic event.

Implications:

• Understanding the patterns of occipital lobe infarction secondary to tentorial herniation aids in accurate diagnosis and prognosis.
• CT imaging is crucial for identifying the extent of infarction and associated lesions, guiding clinical management.
• These findings highlight the complex cerebrovascular consequences of tentorial herniation, emphasizing the need for prompt recognition and intervention.