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Image Number 42 - Lung, bronchus, asthma and 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. 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 mucus glands of the airways as seen at arrow 2. Asthma is usually accompanied by a 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. Arrow 3 highlights a blood vessel filled with RBCs.

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