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Adenoma: Definition, Symptoms and Treatment

An adenoma is a benign tumor that develops from glandular tissue. It can occur in various organs and in some cases carries a risk of becoming malignant.

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Things worth knowing about "Adenoma"

An adenoma is a benign tumor that develops from glandular tissue. It can occur in various organs and in some cases carries a risk of becoming malignant.

What Is an Adenoma?

An adenoma is a benign (non-cancerous) tumor that originates from epithelial glandular tissue. The term derives from the Greek word aden (gland) and the suffix -oma (tumor or swelling). Adenomas can develop in almost any gland-containing organ in the body, including the colon, thyroid, pituitary gland, adrenal glands, liver, and breast. While they are initially benign, certain adenomas can progress to a malignant tumor (carcinoma) over time and therefore require regular medical monitoring.

Types of Adenoma

Several types are distinguished depending on the affected organ and histological structure:

Colon adenoma (colorectal adenoma): A common polyp in the large intestine, considered a precursor to colorectal cancer.
Thyroid adenoma: A benign growth in the thyroid gland that can lead to hyperthyroidism.
Pituitary adenoma: A benign tumor of the pituitary gland that can cause hormonal disorders.
Adrenocortical adenoma: Can produce excess hormones such as cortisol or aldosterone.
Hepatic adenoma: A rare benign liver tumor, often associated with hormonal medication use.
Prostate adenoma: Benign enlargement of the prostate gland (benign prostatic hyperplasia).

Causes and Risk Factors

The exact causes of adenoma development are not always fully understood. Known risk factors include:

Genetic predisposition and family history
Hormonal influences (e.g., estrogen-containing medications in hepatic adenoma)
Chronic inflammation of the affected tissue
Age (risk increases with advancing age)
Unhealthy lifestyle factors (poor diet, physical inactivity, obesity)
Certain genetic syndromes (e.g., familial adenomatous polyposis in the colon)

Symptoms

Many adenomas initially cause no symptoms and are discovered incidentally during routine examinations. Possible symptoms depend on the affected organ:

Colon adenoma: Blood in the stool, changes in bowel habits, abdominal pain
Pituitary adenoma: Headaches, visual disturbances, hormonal imbalances (e.g., excess growth hormone)
Thyroid adenoma: Nodule in the neck, palpitations, weight loss in cases of hyperthyroidism
Adrenocortical adenoma: High blood pressure, weight gain, muscle weakness

Diagnosis

Diagnosis of an adenoma is made using various examination methods depending on the location of the tumor:

Endoscopy / Colonoscopy: Standard procedure for detecting colon adenomas
Ultrasound (sonography): Detection of thyroid or liver adenomas
Magnetic resonance imaging (MRI) / Computed tomography (CT): Imaging to determine size and location
Blood tests (hormone levels): When hormone-producing adenomas are suspected
Biopsy / Histology: Tissue sample to confirm diagnosis and rule out malignancy

Treatment

Treatment depends on the type, location, size, and potential risk of malignant transformation of the adenoma:

Endoscopic removal (polypectomy): Standard treatment for colon adenomas
Surgical resection: For larger adenomas or those with a higher risk of malignancy
Hormone therapy or medication: To manage hormone-producing adenomas
Observation and regular monitoring: For small, asymptomatic adenomas without significant malignancy risk
Radiation therapy: Occasionally used for pituitary adenomas

After removal of an adenoma, regular follow-up examinations are important to detect any recurrence at an early stage.

References

World Health Organization (WHO): Classification of Tumours. WHO Classification of Tumours Editorial Board, IARC Press, Lyon.
Kumar, V., Abbas, A.K., Aster, J.C.: Robbins and Cotran Pathologic Basis of Disease. 10th edition. Elsevier, Philadelphia.
National Cancer Institute (NCI): Adenoma. Available at: https://www.cancer.gov (accessed 2024).

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