Subsequent Bilateral Hippocampal Diffusion Restriction and Atrophy in Repeated Status Epilepticus

Area of Science:

• Neurology
• Neuroscience
• Epileptology

Background:

• Status epilepticus (SE) is a neurological emergency characterized by prolonged seizures.
• The mechanisms underlying cortical lesions in SE remain incompletely understood.
• Antibody-negative limbic encephalitis is a differential diagnosis for SE with hippocampal involvement.

Observation:

• A 75-year-old female with alcohol abuse presented with complex partial status epilepticus.
• Initial EEG showed left frontal/temporal epileptiform discharges; MRI revealed left hippocampal T2-hyperintensity and diffusion restriction.
• After 9 months, she experienced generalized SE with right hippocampal diffusion restriction/T2-hyperintensity and left hippocampal atrophy/gliosis.

Findings:

• The patient experienced sequential, bilateral hippocampal involvement during two separate SE episodes.
• MRI demonstrated evolving structural changes, including diffusion restriction, T2-hyperintensity, atrophy, and gliosis.
• Cerebrospinal fluid analysis was negative for limbic encephalitis-associated antibodies.

Implications:

• This case suggests that prolonged epileptic discharges can lead to permanent, seizure-induced structural brain damage.
• The findings underscore the importance of investigating the long-term structural consequences of SE.
• Further research is needed to elucidate the precise mechanisms of seizure-induced brain injury and its impact on cerebral structural integrity.