A 7-year-old boy is brought to the pediatric neurology clinic by his mother, who reports that he has had 2 episodes of facial twitching and drooling that occurred at night while sleeping over the past 3 months. During these episodes, he was unable to speak clearly but remained aware of his surroundings. Neurological examination and developmental assessment are completely normal. An awake EEG shows normal background activity. The EEG during sleep reveals the pattern marked **A** in the diagram — high-amplitude diphasic sharp waves over the centrotemporal regions with a horizontal dipole, bilateral and independent. What is the most likely diagnosis?

Explanation

## Why Benign Epilepsy with Centrotemporal Spikes (BECTS / Benign Rolandic Epilepsy) is right The pattern marked **A** — centrotemporal sharp waves with horizontal dipole, activated by sleep, with normal background — is the EEG hallmark of BECTS. The clinical presentation is classic: age 7 (peak onset 7–10 years), nocturnal seizures with oromotor features (facial twitching, drooling, speech arrest), preserved consciousness, normal neurological and developmental status, and normal awake EEG that becomes diagnostic during sleep. BECTS is the most common idiopathic focal epilepsy of childhood (15–25% of all childhood epilepsies) and is characterized by autosomal dominant inheritance with age-dependent penetrance. The seizures are brief, infrequent, and remit spontaneously by adolescence in ~99% of cases. (Nelson Pediatrics 21e Ch 611; Adams Neurology 12e Ch 16) ## Why each distractor is wrong - **Childhood Absence Epilepsy (CAE)**: CAE presents with generalized 3 Hz spike-wave discharges (pattern **B**), not centrotemporal sharp waves. CAE typically manifests as frequent brief staring spells (not focal motor seizures) and occurs during wakefulness, not sleep. The EEG pattern is generalized, not focal. - **Panayiotopoulos Syndrome (Benign Occipital Epilepsy of Childhood)**: This condition shows occipital spike-wave discharges (pattern **C**), not centrotemporal sharp waves. Seizures are typically autonomic (vomiting, pallor, tachycardia) rather than oromotor, and the EEG abnormalities are localized to the occipital region. - **Temporal Lobe Epilepsy (TLE)**: TLE shows anterior temporal sharp waves (pattern **D**), not centrotemporal sharp waves. TLE typically presents with older age of onset, longer seizures with automatisms, and impaired consciousness. The EEG dipole is temporal, not centrotemporal. **High-Yield:** BECTS = nocturnal oromotor seizures + centrotemporal sharp waves activated by sleep + normal background + age 3–13 years + spontaneous remission by puberty. [cite: Nelson Pediatrics 21e Ch 611; Adams Neurology 12e Ch 16]