Near Fatal Asthma: Clinical and Airway Biopsy Characteristics

Figure 2

Light microscopic appearance of bronchial biopsy in asthma (magnification scale ×400). Features include early squamous metaplasia of bronchial epithelium, thickened respiratory epithelial basal lamina, and an underlying edematous bronchial wall showing prominent numbers of lymphocytes (purple arrow), some plasma cells (yellow arrow), and a few eosinophils (red arrows).