Idiopathic eosinophilic pneumonia in children: the French experience

Area of Science:

• Pediatric Pulmonology
• Rare Diseases
• Respiratory Medicine

Background:

• Idiopathic eosinophilic pneumonia (IEP) is exceptionally rare in pediatric populations.
• This study presents the first series detailing idiopathic chronic eosinophilic pneumonia (ICEP) and idiopathic acute eosinophilic pneumonia (IAEP) specifically in children.
• Understanding these rare lung conditions is crucial for accurate diagnosis and management.

Purpose of the Study:

• To describe the clinical characteristics and outcomes of pediatric ICEP and IAEP.
• To propose a specific pediatric definition and classification algorithm for ICEP.
• To compare pediatric IAEP with adult cases and identify potential triggers.

Main Methods:

• Retrospective analysis of pediatric ICEP and IAEP cases.
• Data collected from French Reference Centers for rare pediatric lung diseases.
• Review of clinical presentations, treatment responses, and disease progression.

Main Results:

• Five pediatric ICEP cases identified; three showed significant improvement with corticosteroids or immunosuppressants.
• Two pediatric ICEP cases exhibited persistent interstitial patterns progressing to cystic lesions.
• Three adolescent IAEP cases reported, one requiring extracorporeal membrane oxygenation.

Conclusions:

• Pediatric ICEP presents polymorphically, with some cases progressing to cystic changes, blurring lines with interstitial lung diseases.
• A specific pediatric definition and classification for ICEP are proposed.
• Pediatric IAEP appears as an inflammatory lung response to acute toxic exposure, primarily tobacco, similar to adults; international collaboration is needed for further research.