A 42-year-old woman with hemoptysis is seen to have a 2 cm mulberry appearing polypoid lesion in the left mainstem bronchus suspicious for bronchial adenoma. The differential diagnosis includes which of the following:

all of the above

a. Mucoepidermoid carcinoma

b. Plasma cell granuloma

c. Carcinoid tumor

d. Adenoid cystic carcinoma

e. Mucous gland adenoma

The term bronchial adenoma includes a spectrum of tumors arising from epithelial stem cells which vary from the benign mucous gland adenoma to the malignant adenoid cystic and mucoepidermoid carcinomas as well as the carcinoid tumors of similar varied behavior. Among these variants, the carcinoid are most common representing 80%–90% of all bronchial adenomas.