What does adenoma mean?
An adenoma is a benign tumour that arises from glandular tissue, the type of epithelium that produces secretions such as hormones, mucus, or digestive juices. Under the microscope, its cells often arrange themselves into recognizable gland-like patterns, which gives the tumour its name. Adenomas can develop in many organs — the pituitary and adrenal glands, thyroid, liver, and colon among them — and their effects range from harmless to significant: some secrete excess hormones, while others simply occupy space. Crucially, although adenomas are not cancerous, certain varieties, especially colorectal adenomas, can progress to malignancy over years, making them a central target of cancer screening programmes. The word belongs to formal medical vocabulary, appearing in pathology reports, clinical literature, and health journalism. Its plural is usually 'adenomas', though the classical form 'adenomata' also occurs. Understanding the term helps readers interpret news about screening, biopsy results, and hormone disorders with greater confidence.
nounA benign tumour formed from glandular tissue, in which the cells form gland-like structures. Although non-cancerous, some adenomas can become malignant over time.
- A benign tumour composed of glandular epithelial tissue, typically forming gland-like structures.
"The surgeon removed a small adenoma from the patient's thyroid gland."
"A routine scan revealed a pituitary adenoma measuring just a few millimetres."
"Because most colorectal cancers arise from adenomas, regular screening colonoscopies focus on detecting and removing them."
The standard English plural is 'adenomas'; the Latinate plural 'adenomata' appears occasionally in older or more formal medical texts.
"Patients with familial polyposis may develop hundreds of adenomas in the colon."
Most colon cancers begin as an adenoma — which is why doctors get so excited about finding and removing these 'benign' lumps early.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of adenoma
The word 'adenoma' derives from Greek 'adēn', meaning 'gland', combined with the suffix '-oma', used in medicine to denote tumours. It entered English medical usage in the nineteenth century as pathological classification systems developed, alongside related coinages such as 'adenitis' (inflammation of a gland) and 'adenopathy' (gland disease). The same Greek root also underlies 'adenoid' and 'adenosine'.
Related word forms
How adenoma is actually used
A technical medical term used primarily in clinical and pathological contexts rather than everyday speech. Plural is 'adenomas' or, less commonly, the Latinate 'adenomata'. While benign by definition, certain adenomas (notably colorectal adenomas) are considered precancerous and are monitored or removed accordingly.
Easily confused with adenoma
A carcinoma is a malignant (cancerous) tumour arising from epithelial tissue, whereas an adenoma is a benign tumour of glandular origin.
Adenitis is inflammation of a gland, not a tumour; an adenoma is a benign neoplasm of glandular tissue.