Epileptic polyopia with right temporal lobe epilepsy as studied by FDG-PET and MRI: a case report

Area of Science:

• Neurology
• Epileptology
• Neuroimaging

Background:

• Polyopia, a rare visual hallucination, presents as multiple images of a single object.
• Temporal lobe epilepsy is a common form of focal epilepsy often associated with visual disturbances.

Observation:

• A 61-year-old male patient experienced daily polyopia and generalized convulsions.
• Magnetic Resonance Imaging (MRI) revealed swelling in the right amygdala.
• Fluorodeoxyglucose-Positron Emission Tomography (FDG-PET) indicated hypometabolism in the right anterior temporal and mesial occipital regions.

Findings:

• The patient was diagnosed with right temporal lobe epilepsy.
• Polyopia is hypothesized to result from impaired visual information updating in visual association cortices.
• The study identified the mesial temporal lobe as the ictal onset zone and the ipsilateral occipital lobe as the symptomatogenic zone for epileptic polyopia in this case.

Implications:

• This case highlights the complex interplay between mesial temporal and occipital structures in generating epileptic polyopia.
• Understanding these specific neural networks can aid in diagnosing and managing patients with similar visual disturbances.
• Neuroimaging techniques like MRI and FDG-PET are crucial for localizing the epileptogenic zone and understanding the pathophysiology of visual hallucinations in epilepsy.