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Updated: Apr 23, 2026

Refined Murine Model of Idiopathic Pulmonary Fibrosis
Published on: June 17, 2025
Histological evolution of pleuroparenchymal fibroelastosis
Takako Hirota1, Yuji Yoshida, Yasuhiko Kitasato
1Department of Respiratory Medicine, Fukuoka University School of Medicine, Fukuoka, Japan.
Pleuroparenchymal fibroelastosis (PPFE) may develop from initial interstitial inflammation or acute lung injury. Histological analysis shows progression to subpleural fibroelastosis over several years.
Area of Science:
- Pulmonary Pathology
- Histopathology
- Fibrotic Lung Diseases
Background:
- Pleuroparenchymal fibroelastosis (PPFE) is a distinct idiopathic interstitial pneumonia.
- The early histological changes preceding PPFE diagnosis are not well understood.
Observation:
- This study examined four patients with serial lung biopsies or biopsy and autopsy.
- Initial diagnoses included interstitial pneumonia and acute lung injury, not PPFE.
- Histological progression to subpleural fibroelastosis was observed over 3-12 years.
Findings:
- Septal elastosis was noted early in some cases, preceding consolidated subpleural fibroelastosis.
- Interstitial inflammation and fibrosis evolved into less cellular subpleural fibroelastosis.
- Acute lung injury was also identified as a potential precursor in one case.
Implications:
- Interstitial inflammation and acute lung injury may represent early stages in PPFE development.
- Understanding these initial steps can aid in earlier diagnosis and management of PPFE.
- Further research into the pathogenesis of PPFE is warranted.
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