Lung, asthma & chronic bronchitis
Asthma is a condition characterized by recurrent attacks of bronchoconstriction and excessive mucus production, in response to a variety of factors. Bronchitis is an inflammatory response of the airways. Chronic bronchitis is usually the result of many bouts of acute bronchitis. It is characterized histologically by the presence of inflammatory cells (leukocytes) in the interstitium of the lung as seen at arrow 1.
Over time the chronic bronchitis leads to proliferation of the mucous glands of the airways as seen at arrow 2. Arrow 3 highlights a blood vessel filled with RBCs. Asthma is usually accompanied by bronchitis. Other typical features of the asthmatic lung NOT seen in this field are: large numbers of eosinophils, hypertrophy of the bronchial smooth muscle and the presence of Curschman's spirals along with Charcot-Leyden crystals.