• (adenoma, benign) A benign neoplasm arising from epithelium.
  CDISC Terminology
  Clinical Data Interchange Standards Consortium (CDISC), 2021
• A benign epithelial tumor with a glandular organization.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2025
• A benign growth found in the layer of cells that lines certain organs (epithelial cells).
  Harvard Dictionary of Health Terms
  Harvard Medical Publishing, 2011
• A neoplasm that arises from the glandular epithelium. It may be encapsulated or non-encapsulated. The neoplastic glandular epithelial cells may or may not display cellular atypia or dysplasia. Representative examples include gastrointestinal tract adenomas, thyroid gland follicular adenomas, and pituitary neuroendocrine tumors/adenomas. The vast majority are benign.
  NCI
  U.S. National Cancer Institute, 2021
• A tumor that is not cancer. It starts in gland-like cells of the epithelial tissue (thin layer of tissue that covers organs, glands, and other structures within the body).
  NCI Dictionary of Cancer Terms
  U.S. National Cancer Institute, 2021
• Benign epithelial tumor in which the cells form recognizable glandular structures or in which the cells are clearly derived from glandular epithelium.
  CRISP Thesaurus
  National Institutes of Health, 2006