Epilepsy causing pupillary hippus: an unusual semiology

Area of Science:

• Neurology
• Autonomic Nervous System Research
• Epileptology

Background:

• Pupillary hippus, characterized by rhythmic pupillary oscillations, is an uncommon finding during epileptic seizures.
• While autonomic changes are frequent in epilepsy, pupillary hippus as the predominant seizure manifestation is not well-documented in recent literature.

Observation:

• A case study details a woman experiencing epileptic seizures primarily marked by sustained fluctuations in perceived brightness.
• The main semiologic feature observed was bilateral pupillary hippus, an autonomic phenomenon selectively affecting the pupils.

Findings:

• Ictal electroencephalography (EEG) localized the epileptogenic zone to the right posterior parietooccipital regions.
• The study suggests that pupillary reflexes can be modulated by cortical input during seizures.
• Fluctuations in perceived brightness during seizures may correlate with ictal pupillary hippus.

Implications:

• This case expands the understanding of seizure semiology, particularly concerning autonomic phenomena.
• It underscores the potential role of ictal pupillary hippus in specific seizure types and associated sensory disturbances.
• Further research into the neurophysiological mechanisms linking cortical activity, pupillary control, and sensory perception in epilepsy is warranted.