[Short-lasting tentorial herniation may cause cortical blindness. A case report and systematic literature review].

Introduction: Cortical blindness occurs with bilateral damage to the visual cortex. It can be caused by various reasons, including the posterior cerebral arteries stroke due to the tentorial herniation.

Material and methods: A case of a 40-year-old patient with a large right-sided sphenoidal meningioma. A systematic review on the problem of cortical blindness after tentorial herniation according to the PRISMA guideline.

Results: Subtotal removal of dense meningioma. At night after the operation, there was an acute headache, then a coma. Immediately dehydration therapy, tracheal intubation, mechanical ventilation. CT scan showed a small hemorrhage in the tumor bed and subarachnoid space, brain edema and dislocation. After 53 minutes, ventricular drainage was installed, intracranial pressure was normal and ranged from 6 to 14 mmHg. After sedation withdrawal, cortical blindness was detected, which did not regress for 1.5 years. There are no other neurological symptoms, the patient walks, serves herself. Radiation therapy in a total of 54 Gy for the remainder of the grade 1 meningioma ensured tumor control.

Discussion: The time window for restoration of the cerebral blood flow, according to the European Stroke Organization guidelines, is 4.5 hours. In this case, compression of the posterior cerebral arteries lasted less than 53 minutes, however, irreversible ischemia developed in their territory; the outcome on the modified Rankine scale was 4 points. Similar cases are not described in the literature.

Conclusion: Patients should be warned about even the non-obvious risks of neurosurgical intervention, since even timely measures taken do not always avoid complications.