A 24-year-old man presented with hemoptysis and was found to have an endobronchial mass obstructing the superior segmental bronchus of his left lower lobe. Further testing revealed a solid and cystic endobronchial mass with focal calcification, which was diagnosed as mucoepidermoid carcinoma, an uncommon tumor containing mucus-secreting, squamous, and intermediate cells often showing glandular formations and calcifications.

1. A 24-year-old man with hemoptysis A endobronchial mass in superior segmental bronchus of LLL

2. The lumen of superior segment of LLL was completely obstructed by a endobronchial mass

3. PET

4. The lumen of superior segment of LLL was completely obstructed by a yellow solid endobronchial mass

5. A solid and cystic endobronchial masa

6. A solid and cystic endobronchial masa with focal calcification

7. Mucoepidermoid carcinoma Definition: a tumor characterized by a mixture of mucus-secreting cells, squamous cells, and cells of intermediate type

8. Mucoepidermoid carcinoma ; many glands, mucin-filled cysts

9. Mucoepidermoid carcinoma

10. Many calcification

11. Mucoepidermoid carcinoma