Diffuse idiopathic pulmonary neuroendocrine cell hyperplasia.

Area of Science:

• Pulmonary Medicine
• Pathology
• Rare Diseases

Background:

• Diffuse idiopathic pulmonary neuroendocrine cell hyperplasia (DIPNECH) is an exceptionally rare pulmonary lesion.
• Only 39 cases have been documented in medical literature prior to this report.

Observation:

• A 41-year-old male presented with a 5-year history of worsening dyspnea, cough, and wheezing, initially misdiagnosed as asthma.
• Pulmonary function tests indicated airflow obstruction, and CT scans revealed mosaic air trapping with thickened bronchial walls.
• Open lung biopsy demonstrated diffuse proliferation of pulmonary neuroendocrine cells, tumorlet formation, peribronchiolar fibrosis, and obliterative bronchiolitis.

Findings:

• The case presented exhibited characteristics consistent with DIPNECH, including neuroendocrine cell hyperplasia and associated pathological changes.
• Pathologic evaluation of lung tissue, typically through open lung biopsy or lobectomy, remains the definitive diagnostic method for DIPNECH.

Implications:

• This case contributes to the limited understanding of DIPNECH and highlights the importance of considering rare diagnoses in refractory respiratory conditions.
• Accurate pathological diagnosis is crucial for understanding the natural history and potential management strategies for DIPNECH.