Mucous Gland Adenoma
Mucous gland adenomas are rare benign neoplasms believed to arise from minor salivary-type glands of the bronchi. They are usually solitary and their diagnosis is seldom made pre-operatively. Endoscopically, they appear as pink to white sessile polypoid structures with smooth glistening surfaces. Little is known about their radiographic appearance but on CT they have been described as well-demarcated intraluminal masses abutting into the bronchus or presenting with an air-meniscus sign. Others may appear as coin lesions. Grossly the lesions are well circumscribed and, as noted earlier, polypoid in appearance.