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Figure 1. (a) Chest radiograph shows emphysema and multifocal scarring with small nodules in both lungs and a subtle nodular opacity in the left main bronchus (arrow). (b) Unenhanced axial CT at the level of the carina shows a well-defined, popcorn-like, calcified, polypoid endobronchial mass with a broad stalk in the left main bronchus. (c) Flexible and (d) virtual bronchoscopy shows polypoid endobronchial mass with smooth, well-limited surface in the left main bronchus near the carina which obstructed the lumen of the left main bronchus. (e) Microscopic examination of the biopsy specimen shows proliferation of neoplastic spindle cells with squamous metaplasia of the bronchial mucosal epithelium (haematoxylin–eosin, original magnification x 40).
