Micrograph of a tubular adenoma (left of image), a type of colonic polyp and a precursor of colorectal cancer. Normal colorectal mucosa is seen on the right of the image. H&E stain.
Pronunciation
/ˌædɪˈnoʊmə/, /ˌædɪˈnoʊmɪtə/
Specialty
Oncology
An adenoma is a benign tumor of epithelial tissue with glandular origin, glandular characteristics, or both. Adenomas can grow from many glandular organs, including the adrenal glands, pituitary gland, thyroid, prostate, and others. Some adenomas grow from epithelial tissue in nonglandular areas but express glandular tissue structure (as can happen in familial polyposis coli). Although adenomas are benign, they should be treated as pre-cancerous. Over time adenomas may transform to become malignant, at which point they are called adenocarcinomas. Most adenomas 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 adenomas are too small to be seen macroscopically but can still cause clinical symptoms.[citation needed]
An adenoma is a benign tumor of epithelial tissue with glandular origin, glandular characteristics, or both. Adenomas can grow from many glandular organs...
Pituitary adenomas are tumors that occur in the pituitary gland. Most pituitary tumors are benign, approximately 35% are invasive and just 0.1% to 0.2%...
thyroid adenoma is a benign tumor of the thyroid gland, that may be inactive or active (functioning autonomously) as a toxic adenoma. A thyroid adenoma may...
The colorectal adenoma is a benign glandular tumor of the colon and the rectum. It is a precursor lesion of the colorectal adenocarcinoma (colon cancer)...
cases the excess production is due to a benign tumor, known as a pituitary adenoma. The condition is not inherited. Acromegaly is rarely due to a tumor in...
Hepatocellular adenoma (also known as hepatic adenoma or hepadenoma) is a rare, benign liver tumor. It most commonly occurs in people with elevated systemic...
parathyroid adenoma is a benign tumor of the parathyroid gland. It generally causes hyperparathyroidism; there are very few reports of parathyroid adenomas that...
Pleomorphic adenoma (or benign mixed tumor) is a common benign salivary gland neoplasm characterised by neoplastic proliferation of epithelial (ductal)...
adrenocortical adenoma or adrenal adenoma is commonly described as a benign neoplasm emerging from the cells that comprise the adrenal cortex. Like most adenomas, the...
of adenoma, characterized by a slow-growing tumor usually presenting as a pink, flesh-coloured, or yellow papule or nodule.: 662 Sebaceous adenomas, in...
tumors. About 35% of the cases are caused by a single aldosterone-secreting adenoma, a condition known as Conn's syndrome. Many patients experience fatigue...
Adenoma sebaceum, also known as facial angiofibroma is a misnamed cutaneous disorder consisting of angiofibromas that begin in childhood (generally present...
A nipple adenoma is a rare benign tumour of the breast. The condition may also be known as : Florid papillomatosis of the nipple Florid adenomatosis Subareolar...
Nephrogenic adenoma is a benign growth typically found in the urinary bladder. It is thought to result from displacement and implantation of renal tubular...
crypts.[citation needed] Unlike conventional colonic adenomas (e.g. tubular adenoma, villous adenoma), they do not (typically) have nuclear changes (nuclear...
Metanephric adenoma (MA) is a rare, benign tumour of the kidney, that can have a microscopic appearance similar to a nephroblastoma (Wilms tumours), or...
They may be benign (e.g. hyperplastic polyp), pre-malignant (e.g. tubular adenoma) or malignant (e.g. colorectal adenocarcinoma). Colorectal polyps are not...
Pancreatic cancer arises when cells in the pancreas, a glandular organ behind the stomach, begin to multiply out of control and form a mass. These cancerous...
cancer pathogenesis. In this adenoma-carcinoma sequence, normal epithelial cells progress to dysplastic cells such as adenomas, and then to carcinoma, by...
Canalicular adenoma is a type of growth that occurs in human salivary glands. It is a benign growth which occurs in the epithelial cells, and is typically...
pleomorphic adenoma (ca ex PA) is a type of cancer typically found in the parotid gland. It arises from the benign tumour pleomorphic adenoma. Its prognosis...
origin; as an example, endocrine tumors such as thyroid adenomas and adrenocortical adenomas may overproduce certain hormones. The word "benign" means...
colorectal adenomas. Features that distinguish a hyperplastic polyp from a tubular colorectal adenoma are as follows: A sessile serrated adenoma or traditional...
serrated adenoma is a premalignant type of polyp found in the colon, often in the distal colon (sigmoid, rectum). Traditional serrated adenomas are a type...
A chromophobe is a histological structure that does not stain readily, and thus appears relatively pale under the microscope. Chromophobe cells are one...
Adenocarcinoma is the malignant counterpart to adenoma, which is the benign form of such tumors. Sometimes adenomas transform into adenocarcinomas, but most...
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