West syndrome followed by juvenile myoclonic epilepsy: a coincidental occurrence?

Area of Science:

• Neurology
• Epileptology
• Pediatric Neurology

Background:

• West syndrome (WS) is an age-dependent epilepsy typically beginning in infancy, often with poor long-term outcomes.
• While often symptomatic, cryptogenic WS can have favorable prognoses, with rare cases evolving into other epilepsy forms.
• Previous research noted idiopathic WS progressing to childhood absence epilepsy.

Observation:

• A case study reviewed patients with West syndrome, focusing on infantile spasms' clinical evolution.
• One child with West syndrome, beginning at 8 months, later developed specific seizure patterns at 12 and 14 years.
• These later seizures included bilateral myoclonic jerks and generalized tonic-clonic seizures, responsive to Levetiracetam, suggestive of juvenile myoclonic epilepsy.

Findings:

• The presented case details an unusual evolution from West syndrome to features resembling juvenile myoclonic epilepsy.
• This transition, involving specific electroclinical manifestations, has not been previously reported in medical literature.
• The patient's response to Levetiracetam further supports the diagnosis of juvenile myoclonic epilepsy.

Implications:

• The findings suggest shared, genetically determined pathophysiological processes underlying different age-related epilepsy syndromes.
• This case emphasizes that West syndrome may transition into other epilepsy phenotypes, such as juvenile myoclonic epilepsy.
• Understanding these transitions is crucial for diagnosing and managing epilepsy throughout a patient's lifespan.