Focal Onset Seizures in Children: Symptoms, Types & Causes

Focal onset seizures originate in one brain hemisphere. In children, they’re the most common seizure type. Classification depends on awareness:

Types

• Focal aware (simple partial): Consciousness preserved. Motor (clonic, tonic), sensory (tingling, visual), autonomic, or psychic (déjà vu, fear) symptoms.
• Focal impaired awareness (complex partial): Consciousness altered. Automatisms (lip-smacking, fumbling), behavioral arrest, post-ictal confusion.
• Focal to bilateral tonic-clonic: Spread to both hemispheres → generalized convulsion.

Pediatric Etiologies

• Cortical dysplasia (FCD): #1 cause in children — abnormal cortical lamination.
• Hippocampal sclerosis: Mesial temporal scarring (often post-febrile).
• Tuberous sclerosis complex: Cortical tubers, SEGAs.
• Stroke, trauma, infection, tumor, genetic (SCN1A, DEPDC5, etc.).

Diagnosis & Treatment

• Detailed semiology history + video.
• High-res MRI (epilepsy protocol).
• EEG (focal slowing/spikes).
• Genetic panel if developmental delay or family history.
• ASMs first-line (oxcarbazepine, levetiracetam, lacosamide).
• Epilepsy surgery evaluation if drug-resistant — resection, laser ablation, neuromodulation.

Early surgical referral for lesional epilepsy improves developmental outcomes.