An<unk>  is a benign tumor of epithelial tissue with glandular origin, glandular characteristics, or both.<unk> s can grow from many glandular organs, including the adrenal glands, pituitary gland, thyroid, prostate, and others. Some<unk> s grow from epithelial tissue in nonglandular areas but express glandular tissue structure (as can happen in familial polyposis coli). Although<unk> s are benign, they should be treated as pre-cancerous. Over time<unk> s may transform to become malignant, at which point they are called<unk> rcinomas. Most<unk> s do not transform. However, even though benign, they have the potential to cause serious health complications by compressing other structures (mass effect) and by producing large amounts of hormones in an unregulated, non-feedback-dependent manner (causing paraneoplastic syndromes). Some<unk> s are too small to be seen macroscopically but can still cause clinical symptoms.
Adenoma
Mammoplasia
Papilloma
Stoma 
Adenomyomatosis
Epithelial dysplasia
Fibroadenoma
Verrucous carcinoma