Epilepsies

Panayiotopoulos syndrome

A common, self-limited childhood epilepsy with striking autonomic seizures (vomiting, eye deviation, pallor) — almost always with a benign outcome and often without daily medication.

Panayiotopoulos syndrome is one of the most common self-limited focal epilepsies of childhood, accounting for about 6% of all paediatric epilepsies and as many as 13% in the 3–6-year-old age group. It is characterised by infrequent but often very long seizures with prominent autonomic features — typically nausea and vomiting, pallor, pupil changes, eye deviation, loss of awareness and sometimes secondary generalisation — usually during sleep. Despite their alarming appearance (parents often think the child is having a stroke or anaphylaxis), the outlook is excellent: virtually all children become seizure-free, intelligence is unaffected, and most do not need daily antiseizure medication.

At a glance

Onset: Typically 3–6 years (range 1–14)
Hallmark: Long autonomic seizures with vomiting, pallor, eye deviation — often nocturnal
Frequency: Seizures are rare — about a third of children only ever have one
EEG: Multifocal high-amplitude spikes, often with shifting locations; usually occipital but anywhere
Outlook: Excellent — remission within 1–3 years, normal development

What it is

Panayiotopoulos syndrome is a self-limited (age-related) focal childhood epilepsy first described in detail by C. P. Panayiotopoulos in the 1980s. Although it was historically called 'early-onset benign childhood occipital epilepsy', the modern ILAE classification simply uses 'Panayiotopoulos syndrome', because the seizures do not always begin in the occipital cortex and the EEG abnormalities can be multifocal.

It usually starts in pre-school-age children (peak 3–6 years) who are otherwise developing normally. There is often a family history of febrile seizures or epilepsy. The underlying biology is presumed to be a genetic maturational hyper-excitability that the child grows out of as the cortex matures.

How it presents

The hallmark is a long autonomic seizure, usually beginning in sleep. A typical event unfolds over many minutes — sometimes more than an hour — and includes several of:

Feeling unwell, looking pale or flushed, retching
Repeated vomiting (the most characteristic feature)
Tonic deviation of the eyes to one side
Pupil dilation, sweating, increased salivation, urinary or faecal incontinence
Mid-seizure deterioration of awareness, then unresponsiveness
In about half, secondary hemiclonic or generalised tonic-clonic activity at the end
Often a long post-ictal sleep

About a third of children have only a single seizure. Around half have 2–10 seizures in total. Status epilepticus (especially autonomic status) is more common than in most other paediatric epilepsies, and is part of the syndrome rather than a complication.

Diagnosis

The diagnosis is clinical and supported by EEG. The story is usually so distinctive that experienced clinicians can recognise it on history alone — although families and emergency teams often mistake the events for severe acute illness (gastroenteritis, encephalitis, stroke, anaphylaxis) and the child often arrives via the emergency department with a normal MRI.

EEG typically shows multifocal high-amplitude sharp waves, very often involving the occipital regions but also frontal, central and temporal areas; the location can shift between recordings. Background activity is normal. The interictal EEG can be markedly more abnormal than the seizure frequency would suggest — and a normal EEG does not rule the diagnosis out, particularly later in the course.

MRI of the brain is essential to exclude structural causes such as occipital cortical malformations, gliomas, or cysts (especially if the seizures begin outside the typical age range or do not behave as expected). In Panayiotopoulos syndrome the MRI is normal.

Treatment

Because seizures are infrequent and the outlook is so good, the default position is no daily antiseizure medication for most children. Decisions are individualised:

A child with a single, classic seizure and a supportive EEG is usually not started on daily medication; instead, families are given a rescue plan (a written care plan + buccal midazolam or rectal diazepam at home) and clear safety advice.
Daily prophylaxis is considered when seizures are recurrent and disruptive, prolonged status episodes occur, or the family situation makes the rescue plan impractical. Carbamazepine, oxcarbazepine, levetiracetam and valproate are all reasonable choices. Levetiracetam is widely used because of its convenience.
Long acute seizures are treated as autonomic status epilepticus: buccal or intranasal midazolam at home, IV lorazepam in hospital, with usual escalation if needed.
Education for parents and schools is part of treatment — explaining that vomiting and pallor here are seizures, not gastroenteritis or shock, prevents repeated emergency admissions and unnecessary investigations.

Prognosis

The outlook is excellent. Most children become seizure-free within 1–3 years of onset and the great majority by the age of 12. Intelligence, learning and behaviour are unaffected, and there is no need for long-term medication in the typical course. A small minority go on to have brief focal seizures (occipital or otherwise) in late childhood, and very occasionally a child with Panayiotopoulos syndrome later evolves a different focal epilepsy.

How an educational review can help

Panayiotopoulos seizures are frightening to witness and frequently misdiagnosed in the emergency department. An educational review can help families understand why the clinical picture fits the syndrome, what the EEG shows, why a daily medication may or may not be needed, and how to put a safe and confident plan together for nursery, school and home — including the rescue medication script.

It is an educational second opinion — not a diagnosis, treatment or prescription — and it does not replace the care of your child's own clinicians.

Selected sources

Panayiotopoulos CP. Panayiotopoulos syndrome: a common and benign childhood epileptic syndrome. John Libbey, 2002 (and subsequent editions).
Specchio N et al. International League Against Epilepsy classification and definition of epilepsy syndromes with onset in childhood: Position paper by the ILAE Task Force on Nosology and Definitions. Epilepsia. 2022; 63(6): 1398–1442.
Caraballo R et al. Panayiotopoulos syndrome: a review of clinical characteristics, evolution and management. Epileptic Disord. 2018.
Verrotti A et al. Diagnosis and management of Panayiotopoulos syndrome. Eur J Paediatr Neurol. 2020.

Last reviewed: 2026-05-27

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