Case 3, mucoepidermoid carcinoma, histological findings. A: The tumor was pathologically diagnosed as mucoepidermoid Carcinoma (HE stain x 5). Neoplastic infiltration of the bronchial submucosa characterized by a mixture of glands, tubules, cysts and solid areas; B: Glandular component of the tumor, lined by columnar mucinous cells and containing mucin, is intimately admixed with solid islands composed of squamous and intermediate cells (HE stain x 63).