Figure 1.

Mucoepidermoid carcinoma. (A) axial chest CT image showing the complete obstruction of the left main stem bronchus. The obstructive lesion is highly vascularized with a bronchial artery branch originating from the descending aorta (arrow); (B) chest CT three-dimensional reconstruction showing the complete obstruction of the left main stem (arrow); (C) bronchoscopic image showing the complete obstruction of the left main stem by a large tumor (arrow); (D) microscopic image of biopsy showing mucoepidermoid carcinoma. The image shows neoplastic tissue composed of round to oval epithelioid cells and occasional goblet cells (red arrow) punctuated by mucin containing cystic spaces (yellow arrow). Hematoxylin and Eosin stain (200×); (E) microscopic image showing mucicarmine staining of mucoepidermoid carcinoma. The image shows intracellular (blue arrow) and extracellular mucin (yellow arrow). Mucicarmine stain (200×).