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Updated: May 13, 2026

A Model for Epilepsy of Infectious Etiology using Theiler's Murine Encephalomyelitis Virus
Published on: June 23, 2022
Diverse seizure presentation of acute Mycoplasma pneumoniae encephalitis resolving with immunotherapy
Dimitrios Arkilo1, Beth Pierce, Frank Ritter
11Minnesota Epilepsy Group, St. Paul, MN, USA.
Insights
Three children with new-onset seizures, refractory to antiepileptic drugs, recovered fully after immunotherapy. Mycoplasma pneumoniae infection was identified as a potential cause for these pediatric epilepsy cases.
Area of Science:
- Pediatric Neurology
- Infectious Diseases
- Immunology
Background:
- New-onset seizures in children can be challenging to manage, particularly when refractory to standard antiepileptic medications.
- Identifying underlying causes, including infectious triggers, is crucial for effective treatment strategies in pediatric epilepsy.
Observation:
- Three previously healthy children presented with new-onset, severe, and refractory seizures.
- All patients exhibited serum immunoglobulin M positivity for Mycoplasma pneumoniae.
- Symptoms included focal motor seizures, nonconvulsive seizures, and hallucinations.
Findings:
- Aggressive management combining immunotherapy (intravenous steroids and immunoglobulin) with antiepileptic medications led to significant clinical improvement.
- All three patients achieved virtually complete recovery and excellent seizure control.
- Mycoplasma pneumoniae infection is implicated as a potential cause of new-onset refractory epilepsy in these pediatric cases.
Implications:
- This case series suggests that Mycoplasma pneumoniae infection should be considered in the differential diagnosis of new-onset pediatric seizures.
- Immunotherapy, alongside antiepileptic drugs, may be a highly effective treatment approach for seizure disorders associated with Mycoplasma pneumoniae.
- Early and aggressive treatment can lead to favorable long-term outcomes in children presenting with severe, infection-associated epilepsy.
Abstract:
We report 3 previously normal children that presented for evaluation of new onset seizures. Case 1, a 7-year-old female, presented with refractory left frontal lobe seizures associated with right arm simple motor seizures refractory to 6 antiepileptic medications at sufficient doses and levels. Case 2, a 15-year-old female, presented with left frontotemporal lobe seizures and nonconvulsive seizures, associated with neuropsychiatric symptoms refractory to 5 antiepileptic medications. Both patients received intravenous steroids and intravenous immunoglobulin. Case 3, an 11-year-old male, presented with a generalized tonic clonic seizure and worsening hallucinations responding to intravenous corticosteroids and 1 antiepileptic medication. All 3 patients had extensive infectious and metabolic evaluation and were found to be serum immunoglobulin M positive for mycoplasma pneumoniae. Despite their prolonged severe symptoms, all patients had virtually complete recovery with excellent seizure control after aggressive seizure management with immunotherapy and antiepileptic medication.
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