Benign tumor
Benign tumors are non-cancerous growths that can still cause harm.
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A benign tumor is a mass of cells that does not invade neighboring tissue or metastasize. Compared to malignant tumors, benign tumors generally have a slower growth rate and relatively well differentiated cells. They are often surrounded by a fibrous sheath or contained within the epithelium.
Common examples include moles and uterine fibroids. While the word 'benign' means favorable, a benign tumor is not benign in the usual sense; the name merely specifies that it is not cancerous. Benign tumors usually do not pose a serious health risk, but they can be harmful or fatal, especially if they cause a mass effect that compresses neighboring tissues, leading to nerve damage, ischemia, necrosis, or organ damage.
Tumors in enclosed spaces such as the cranium can be life-threatening. Some benign tumors, such as endocrine tumors, may overproduce hormones. Many types have the potential to become cancerous through tumor progression.
Quick Facts
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- Oncology, pathology
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Lore & Background
Benign tumors are diverse and may be asymptomatic or cause specific symptoms depending on their anatomic location and tissue type. They grow outward, producing large, rounded masses that can cause a mass effect, compressing local tissues or organs. This can lead to blockage of ducts, reduced blood flow (ischaemia), tissue death (necrosis), and nerve pain or damage.
Some tumors produce hormones that can lead to life-threatening situations; for example, insulinomas can produce large amounts of insulin causing hypoglycemia, and pituitary adenomas can cause elevated levels of growth hormone, prolactin, ACTH, and other hormones. Cosmetic effects can be caused by skin tumors, possibly causing psychological or social discomfort. Vascular tissue tumors can bleed, in some cases leading to anemia.
Reader's Guide
Benign tumors are significant because they represent a common class of growths that, while not cancerous, can still cause serious health problems. Their ability to compress vital structures, produce hormones, or undergo malignant transformation makes them clinically important. Many benign tumors have the potential to become cancerous through tumor progression, which is why some are removed by surgery. When removed, they usually do not return, though exceptions may indicate malignant transformation.
Benign tumors also serve as models for understanding tumor biology, as seen in genetic syndromes like PTEN hamartoma syndrome, familial adenomatous polyposis, tuberous sclerosis complex, and Von Hippel–Lindau disease, where mutations in tumor suppressor genes lead to benign tumor formation. These conditions highlight the molecular pathways involved in cell growth and proliferation. The legacy of benign tumor research lies in its contribution to cancer prevention and treatment, as well as in the management of conditions that can cause significant morbidity.
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Sources
Compiled from Wikipedia and the sources listed below. Text from Wikipedia is available under CC BY-SA 4.0; this entry is adapted from it.
- Wikipedia: Benign tumor (CC BY-SA 4.0).
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