Etiology, Prevalence, and Epidemiology Pulmonary vasculitis is traditionally characterized by size of vessel involvement as defined by the Chapel Hill nomenclature. Within the small-vessel vasculitides, antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis represents a diverse group of entities, and although the inciting…
Etiology, Prevalence, and Epidemiology Pulmonary metastases are common—present at autopsy in 20% to 54% of patients with extrapulmonary malignancy. The most common primary sites associated with pulmonary metastases in biopsy series are the breast, colon, kidney, uterus, bladder, melanoma, and…
Neuroendocrine Hyperplasia and Pulmonary Tumorlets Etiology, Prevalence, and Epidemiology Normal lung tissue contains scattered neuroendocrine (Kulchitsky) cells within the bronchial and bronchiolar epithelium. These cells play a role in the detection of hypoxia as well as fetal lung development and…
Etiology, Prevalence, and Epidemiology Pneumonia and influenza represent the eighth leading cause of mortality in the United States, with an estimated 1.3 million hospital admissions yearly attributable to pneumonia in patients older than 65 years. Although pneumonia affects all ages,…