Histopathology of<unk> : Smoker's macrophages (arrow); mild interstitial lymphocytic infiltrate and mild fibrosis (arrowhead) Diagnosis of<unk>  requires a correlation of clinical, radiologic and pathologic findings: *Clinical: Symptoms and pulmonary function testing *Radiologic: Chest radiograph and high-resolution computed tomography *Pathologic: Lung biopsy with "smoker's macrophages" limited to distal airspaces and peribronchiolar airspaces, and minimal to absent peribronchiolar interstitial fibrotic thickening
Respiratory bronchiolitis
Croup
Whooping cough
Bronchopulmonary dysplasia
Acute respiratory distress syndrome
Pneumococcal pneumonia
Community-acquired pneumonia
Bronchorrhea