Neuroepithelial cyst causing homonymous hemianopia treated through surgical marsupialization under visual-evoked potentials: A case report.

Background: Neuroepithelial cysts (NECs) are rare entities, occasionally causing neurological symptoms that can be overlooked.

Case description: A case of an occipital neuroepithelial cyst is discussed. The initial presentation consisted of mild homonymous hemianopia and gait impairment. Conservative management was suggested to start with, but at 6 months follow-up, the patient's symptoms were worsening. Surgery was performed under general anesthetic and using visual-evoked potentials. The cyst was marsupialized and connected with subdural space, and a few samples were sent for histological analysis. The patient experienced immediate improvement in her symptoms, and the visual tests at follow-up confirmed the resolution of the previously documented hemianopia.

Conclusion: NECs should be carefully assessed to rule out symptoms associated with mass effects. This case and others reported in the international literature show that occipital neuroepithelial cysts can benefit from surgical treatment with meticulous preoperative planning. The aid of neuromonitoring is crucial to identify anatomical variations and cortical functionality that are potentially distorted in the presence of these lesions.