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Diffuse idiopathic pulmonary neuroendocrine cell proliferation presenting as interstitial lung disease
O A Armas1, D A White, R A Erlandson
1Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA.
The American Journal of Surgical Pathology
|August 1, 1995
Summary
Pulmonary neuroendocrine cell (PNEC) hyperplasia can occur without lung disease, presenting as an interstitial lung process. This case shows diffuse PNEC proliferation in the lungs, leading to fibrosis and reduced lung function.
Area of Science:
- Pulmonary Medicine
- Cell Biology
- Pathology
Background:
- Pulmonary neuroendocrine cell (PNEC) hyperplasia is typically adaptive to high altitudes or reactive to lung injury.
- PNEC hyperplasia can occur without prior lung disease, potentially causing airway issues like tumorlets and fibrosis.
Observation:
- A patient presented with an interstitial lung process and diffuse PNEC proliferation without chronic pulmonary disorder.
- Open lung biopsy revealed extensive intraepithelial PNEC populations in distal airways and alveoli, with alveolar thickening and interstitial fibrosis.
Findings:
- The proliferation showed neuroendocrine differentiation via light and ultrastructural microscopy.
- Alveolar thickening due to PNEC proliferation contributed to mild reductions in pulmonary diffusing capacity.
- Absence of airway fibrosis and tumorlets correlated with no clinical airway disease.
Implications:
- This case highlights diffuse PNEC hyperplasia as a distinct entity presenting as an interstitial lung process.
- The findings suggest PNEC hyperplasia can cause lung dysfunction even without neoplastic transformation.
- Further research is needed to understand the pathogenesis and clinical significance of PNEC hyperplasia in non-neoplastic lung conditions.