Figure 2

Macroscopic and microscopic photographs showing a cavity (Cv) and an inflamed bronchus (Br). (A) Macroscopic examination of the specimen (left rectangle) shows thickening of some parts of the cavity wall and the bronchial wall. Two individual caseated nodules (Nd) are located close to the bronchus. Hematoxylin and eosin staining (original magnification, ×25) shows extensive infiltration of inflammatory cells within the cavity wall. The bronchial epithelium is severely desquamated with some intact remaining regions (right rectangle). (B) An enlarged photograph of right rectangle in A showing bronchial epithelium (BE) and bronchial cartilage (CT). Several multi-nucleated giant cells (GC) and severe mononuclear cells infiltration are found in the bronchial wall and Ziehl-Neelsen staining (photograph in the rectangle, ×1000) detected some Mycobacterium tuberculosis bacilli in caseum. (Hematoxylin and eosin staining, ×100.)