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== Adenoma ==
{{Infobox medical condition
 
| name            = Adenoma
An '''adenoma''' is a type of [[tumor]] originating from glandular tissue. Though it is not [[cancer|cancerous]], certain types of adenomas can become malignant if left untreated. Adenomas are characterized by their ability to produce and secrete substances that are typical for the gland from which they originate.
| image          =[[File:Tubular_adenoma_2_intermed_mag.jpg]]
 
| caption        = Micrograph of a [[tubular adenoma]]
[[File:Histopathology of adrenocortical adenoma.jpg|alt=Histopathology of adrenocortical adenoma|thumb|Histopathology of adrenocortical adenoma]]
| field          = [[Oncology]]
 
| synonyms        =  
===Pathophysiology===
| symptoms        = Often asymptomatic, may cause [[hormonal imbalance]] if functional
 
| complications  = Potential progression to [[adenocarcinoma]]
Adenomas develop from the gland-like cells of the [[epithelial tissue]], which is a thin sheet of cells covering and lining various structures in the body including [[organs]], [[glands]], and other internal cavities. The epithelial tissue serves various functions such as secretion, absorption, protection, and sensation. When cells in this tissue undergo benign proliferation, adenomas form.
| onset          = Varies depending on type and location
 
| duration        = Indeterminate, may remain stable or progress
<youtube>
| types          = [[Tubular adenoma]], [[villous adenoma]], [[tubulovillous adenoma]]
title='''{{PAGENAME}}'''  
| causes          = [[Genetic mutations]], [[environmental factors]]
movie_url=http://www.youtube.com/v/qtDG0KqIAG0
| risks          = [[Age]], [[family history]], [[diet]], [[smoking]]
&rel=1
| diagnosis      = [[Biopsy]], [[endoscopy]], [[imaging studies]]
embed_source_url=http://www.youtube.com/v/qtDG0KqIAG0
| differential    = [[Hyperplasia]], [[adenocarcinoma]], [[polyp]]
&rel=1
| prevention      = Regular [[screening]], healthy [[diet]], avoiding [[smoking]]
wrap = yes
| treatment      = [[Surgical removal]], [[endoscopic resection]]
width=750
| medication      = None specific, may use [[hormonal therapy]] if functional
height=600
| prognosis      = Generally good if benign, risk of malignancy varies
</youtube>
| frequency      = Common, varies by type and location
 
| deaths          = Rare, unless progresses to malignancy
===Clinical Relevance===
}}
While adenomas are benign and do not invade nearby tissues or spread to distant parts of the body, certain types can increase the risk of developing into cancer. For instance, adenomas in the colon, known as adenomatous polyps, have the potential to develop into colon cancer if not detected and removed.
{{Short description|Benign glandular tumors with potential malignant transformation}} {{Infobox medical condition (new) | name = Adenoma | synonyms = Adenomatous tumor | image = Histopathology of adrenocortical adenoma.jpg | alt = Histopathology of adrenocortical adenoma | caption = Histopathology of an adrenocortical adenoma | pronounce = | field = [[Oncology]], [[Pathology]], [[Endocrinology]], [[Gastroenterology]] | symptoms = Often asymptomatic; may cause hormonal imbalance, obstruction, pain | complications = Malignant transformation, bleeding, organ dysfunction | onset = Variable; often detected in adults | duration = Chronic (often lifelong surveillance required) | types = Colorectal, pituitary, thyroid, adrenal, hepatic, renal, sebaceous | causes = Genetic mutations, hormonal imbalance, environmental factors | risks = Age, genetics, obesity, hormonal therapy, radiation exposure | diagnosis = Clinical evaluation, imaging, laboratory tests, biopsy | differential = Hyperplastic polyps, adenocarcinoma, neuroendocrine tumors | prevention = Lifestyle modifications, genetic screening | treatment = Surveillance, endoscopic removal, surgical excision, medical therapy | medication = Hormone suppressants, antithyroid medications, dopamine agonists | prognosis = Generally good; dependent on type, size, and malignant risk | frequency = Common (colorectal adenomas); other types vary | deaths = Rare, usually due to malignant transformation or complications }}
 
'''Adenoma''' is a type of [[benign tumor]] originating from [[glandular epithelial cells]]. Although adenomas themselves are benign, some possess the potential to progress into malignant tumors ([[adenocarcinoma]]). They commonly affect various glandular organs, including the [[colon]], [[pituitary gland]], [[thyroid gland]], [[adrenal gland]], [[liver]], and [[kidney]]. Understanding their characteristics, potential complications, and management strategies is vital for early detection and treatment.
===Common adenomas===
== Definition and Characteristics ==
* '''[[Adenoma of the adrenal gland]]:''' Often discovered as incidental findings on imaging tests, most are non-functioning, meaning they do not secrete hormones.
An adenoma arises from glandular epithelial tissue, forming a well-defined, localized mass. Despite their benign nature, adenomas can cause complications by:
* '''[[Adenoma of the colon]]:''' Known as polyps, these can become precursors to colon cancer.
* Compressing nearby structures (mass effect)
* '''[[Adenoma of the kidneys]]:''' Typically small and benign.
* Producing excess hormones ([[functional adenomas]])
* '''[[Adenoma of the thyroid]]:''' These are benign growths that may produce excess thyroid hormones leading to hyperthyroidism.
* Potentially transforming into malignant adenocarcinoma (notably colorectal adenomas)
* '''[[Adenoma of the pituitary]]:''' Can lead to various conditions due to hormone overproduction, like Cushing's disease or acromegaly.
== Epidemiology ==
* '''[[Adenoma of the parathyroid]]:''' Might result in hyperparathyroidism, causing elevated calcium levels in the blood.
The frequency and clinical significance of adenomas vary by organ:
* '''[[Adenoma of the liver]]:''' Rare, can be associated with oral contraceptive use or certain metabolic conditions.
* '''Colorectal adenomas''': Common in adults >50 years; precursors to colorectal cancer.
* '''[[Adenoma of the breast]]:''' Often palpable lumps that may be discovered during routine self-examinations or mammography.
* '''Pituitary adenomas''': Account for 10–15% of intracranial tumors.
* '''[[Adenoma of the appendix]]:''' Uncommon and typically found incidentally during appendectomy.
* '''Thyroid adenomas''': Frequent in women; detected as thyroid nodules.
* '''[[Adenoma of the bronchial]]:''' Can lead to bronchial obstructions.
* '''Hepatic adenomas''': Rare; linked to oral contraceptive use.
* '''[[Adenoma of the sebaceous]]:''' Usually small and manifest on the skin.
== Clinical Significance ==
* '''[[Adenoma of the salivary glands]]:''' Typically benign tumors of salivary gland origin.
Adenomas can significantly impact health due to:
* '''[[Adenoma of the prostate]]:''' Benign growths that can increase prostate size, leading to urinary symptoms.
* '''Hormonal imbalance''': Functional adenomas can cause endocrine disorders (e.g., Cushing’s syndrome, hyperthyroidism).
==See also==
* '''Obstruction''': Large adenomas in the colon may cause bowel obstruction.
 
* '''Malignant potential''': Particularly colorectal adenomas that can transform into colorectal cancer.
* [[Benign tumors]]
* Early identification and management are essential to reduce morbidity.
* [[Epithelial cells]]
== Types of Adenomas ==
* [[Polyps]]
Adenomas vary by anatomical location and behavior:
* [[Hyperplasia]]
=== Colorectal Adenomas ===  
{{stub}}
[[File:Colonic polyp.jpg|Colonic polyp|thumb]]
{{ICDOMorphology}}
Common precursors to colorectal cancer; subtypes include:
[[Category:Anatomical pathology]]
* [[Tubular adenoma]]
[[Category:Glandular and epithelial neoplasia]]
* [[Villous adenoma]]
* [[Tubulovillous adenoma]]
* [[Serrated adenoma]]
=== Pituitary Adenomas ===  
Arise in the [[pituitary gland]]; subtypes include:
* [[Prolactinoma]]
* [[Growth hormone-secreting adenoma]]
* [[ACTH-secreting adenoma]]
* Non-functioning adenomas
=== Thyroid Adenomas ===
[[File:Thyroid adenoma.jpg|Thyroid adenoma|thumb]]
Often solitary nodules arising from follicular cells; subtypes include:
* [[Follicular adenoma]]
* [[Toxic adenoma]]
=== Adrenal Adenomas ===
[[File:Histopathology of adrenocortical adenoma.jpg|alt=Histopathology of adrenocortical adenoma|thumb|Histopathology of adrenocortical adenoma]]
Occur in adrenal cortex; may produce hormones (e.g., cortisol or aldosterone):
* Functioning adenomas ([[Cushing’s syndrome]], [[Conn’s syndrome]])
=== Hepatic Adenomas ===
Benign liver tumors associated with oral contraceptive use; risk of hemorrhage or malignant transformation.
=== Renal Adenomas ===
Small benign kidney tumors; usually incidental findings.
=== Sebaceous Adenomas ===
Associated with sebaceous glands; linked to [[Muir-Torre syndrome]].
== Causes and Risk Factors ==
[[File:Adenoma-carcinoma pathway.png|Adenoma-carcinoma pathway|thumb]] Adenomas develop due to genetic mutations, hormonal disturbances, and environmental factors:
* '''Genetic conditions''' (e.g., [[Familial adenomatous polyposis]], [[Multiple endocrine neoplasia]])
* '''Hormonal imbalances''' (pituitary, thyroid, adrenal adenomas)
* '''Diet and obesity''' (colorectal adenomas)
* '''Oral contraceptives''' (hepatic adenomas)
* '''Radiation exposure''' (thyroid adenomas)
== Symptoms and Complications ==
Symptoms depend on adenoma location and hormone secretion:
* '''Colorectal adenomas''': Rectal bleeding, bowel habit changes
* '''Pituitary adenomas''': Vision changes, hormonal imbalance
* '''Thyroid adenomas''': Hyperthyroidism, neck lump
* '''Adrenal adenomas''': Cushing’s or Conn’s syndrome
* '''Hepatic adenomas''': Abdominal pain, risk of bleeding
* '''Renal adenomas''': Usually asymptomatic
Complications include malignant transformation, organ obstruction, hormonal disturbances, and bleeding.
== Diagnosis ==
[[File:Cytopathology of pleomorphic adenoma.png|Cytopathology of pleomorphic adenoma|thumb]]  
Diagnosis involves:
* '''Clinical evaluation''': History, physical exam
* '''Imaging''': [[Colonoscopy]], ultrasound, MRI, CT
* '''Laboratory tests''': Hormone levels, tumor markers
* '''Histopathology''': Biopsy confirms diagnosis
== Treatment and Management ==
Treatment varies by adenoma type and risk factors:
* '''Observation''': Small, asymptomatic adenomas
* '''Endoscopic removal''': Colorectal polyps
* '''Surgical excision''': Large or high-risk adenomas
* '''Medical therapy''': Hormone-suppressing medications for pituitary and adrenal adenomas
Long-term monitoring is often required due to recurrence risk.
== Prognosis ==
Prognosis depends on adenoma type and malignant potential:
* Generally favorable with early detection and treatment
* High-risk adenomas require ongoing surveillance to prevent cancer progression
== Prevention ==
Preventive strategies include lifestyle modifications, regular screenings (colonoscopy), genetic counseling, and hormonal regulation.
== Gallery ==
<gallery>
File:Histopathology of traditional serrated adenoma, low magnification.jpg|Traditional serrated adenoma histopathology
File:Adenoma-carcinoma pathway.png|Adenoma-carcinoma progression diagram
</gallery>
== See also ==
* [[Benign tumor]]
* [[Adenocarcinoma]]
* [[Polyp]]
* [[Familial adenomatous polyposis]]
* [[Multiple endocrine neoplasia]]
== External links ==
[https://www.cancer.org American Cancer Society – Adenomas]
[https://rarediseases.info.nih.gov Genetic and Rare Diseases Information Center (GARD)]
{{Tumors}} {{Endocrine disorders}} [[Category:Benign tumors]] [[Category:Gastrointestinal disorders]] [[Category:Endocrinology]] [[Category:Oncology]] [[Category:Hepatology]] [[Category:Neuroscience]] [[Category:Anatomical pathology]] [[Category:Glandular and epithelial neoplasia]] {{stub}}

Latest revision as of 05:08, 4 April 2025


Adenoma
Error creating thumbnail:
Synonyms
Pronounce N/A
Specialty N/A
Symptoms Often asymptomatic, may cause hormonal imbalance if functional
Complications Potential progression to adenocarcinoma
Onset Varies depending on type and location
Duration Indeterminate, may remain stable or progress
Types Tubular adenoma, villous adenoma, tubulovillous adenoma
Causes Genetic mutations, environmental factors
Risks Age, family history, diet, smoking
Diagnosis Biopsy, endoscopy, imaging studies
Differential diagnosis Hyperplasia, adenocarcinoma, polyp
Prevention Regular screening, healthy diet, avoiding smoking
Treatment Surgical removal, endoscopic resection
Medication None specific, may use hormonal therapy if functional
Prognosis Generally good if benign, risk of malignancy varies
Frequency Common, varies by type and location
Deaths Rare, unless progresses to malignancy


Benign glandular tumors with potential malignant transformation


Adenoma
Histopathology of adrenocortical adenoma
Synonyms Adenomatous tumor
Pronounce
Field Oncology, Pathology, Endocrinology, Gastroenterology
Symptoms Often asymptomatic; may cause hormonal imbalance, obstruction, pain
Complications Malignant transformation, bleeding, organ dysfunction
Onset Variable; often detected in adults
Duration Chronic (often lifelong surveillance required)
Types Colorectal, pituitary, thyroid, adrenal, hepatic, renal, sebaceous
Causes Genetic mutations, hormonal imbalance, environmental factors
Risks Age, genetics, obesity, hormonal therapy, radiation exposure
Diagnosis Clinical evaluation, imaging, laboratory tests, biopsy
Differential diagnosis Hyperplastic polyps, adenocarcinoma, neuroendocrine tumors
Prevention Lifestyle modifications, genetic screening
Treatment Surveillance, endoscopic removal, surgical excision, medical therapy
Medication Hormone suppressants, antithyroid medications, dopamine agonists
Prognosis Generally good; dependent on type, size, and malignant risk
Frequency Common (colorectal adenomas); other types vary
Deaths Rare, usually due to malignant transformation or complications


Adenoma is a type of benign tumor originating from glandular epithelial cells. Although adenomas themselves are benign, some possess the potential to progress into malignant tumors (adenocarcinoma). They commonly affect various glandular organs, including the colon, pituitary gland, thyroid gland, adrenal gland, liver, and kidney. Understanding their characteristics, potential complications, and management strategies is vital for early detection and treatment.

Definition and Characteristics[edit]

An adenoma arises from glandular epithelial tissue, forming a well-defined, localized mass. Despite their benign nature, adenomas can cause complications by:

  • Compressing nearby structures (mass effect)
  • Producing excess hormones (functional adenomas)
  • Potentially transforming into malignant adenocarcinoma (notably colorectal adenomas)

Epidemiology[edit]

The frequency and clinical significance of adenomas vary by organ:

  • Colorectal adenomas: Common in adults >50 years; precursors to colorectal cancer.
  • Pituitary adenomas: Account for 10‚Äì15% of intracranial tumors.
  • Thyroid adenomas: Frequent in women; detected as thyroid nodules.
  • Hepatic adenomas: Rare; linked to oral contraceptive use.

Clinical Significance[edit]

Adenomas can significantly impact health due to:

  • Hormonal imbalance: Functional adenomas can cause endocrine disorders (e.g., Cushing‚Äôs syndrome, hyperthyroidism).
  • Obstruction: Large adenomas in the colon may cause bowel obstruction.
  • Malignant potential: Particularly colorectal adenomas that can transform into colorectal cancer.
  • Early identification and management are essential to reduce morbidity.

Types of Adenomas[edit]

Adenomas vary by anatomical location and behavior:

Colorectal Adenomas[edit]

File:Colonic polyp.jpg
Colonic polyp

Common precursors to colorectal cancer; subtypes include:

Pituitary Adenomas[edit]

Arise in the pituitary gland; subtypes include:

Thyroid Adenomas[edit]

File:Thyroid adenoma.jpg
Thyroid adenoma

Often solitary nodules arising from follicular cells; subtypes include:

Adrenal Adenomas[edit]

Histopathology of adrenocortical adenoma
Histopathology of adrenocortical adenoma

Occur in adrenal cortex; may produce hormones (e.g., cortisol or aldosterone):

Hepatic Adenomas[edit]

Benign liver tumors associated with oral contraceptive use; risk of hemorrhage or malignant transformation.

Renal Adenomas[edit]

Small benign kidney tumors; usually incidental findings.

Sebaceous Adenomas[edit]

Associated with sebaceous glands; linked to Muir-Torre syndrome.

Causes and Risk Factors[edit]

File:Adenoma-carcinoma pathway.png
Adenoma-carcinoma pathway

Adenomas develop due to genetic mutations, hormonal disturbances, and environmental factors:

Symptoms and Complications[edit]

Symptoms depend on adenoma location and hormone secretion:

  • Colorectal adenomas: Rectal bleeding, bowel habit changes
  • Pituitary adenomas: Vision changes, hormonal imbalance
  • Thyroid adenomas: Hyperthyroidism, neck lump
  • Adrenal adenomas: Cushing‚Äôs or Conn‚Äôs syndrome
  • Hepatic adenomas: Abdominal pain, risk of bleeding
  • Renal adenomas: Usually asymptomatic

Complications include malignant transformation, organ obstruction, hormonal disturbances, and bleeding.

Diagnosis[edit]

File:Cytopathology of pleomorphic adenoma.png
Cytopathology of pleomorphic adenoma

Diagnosis involves:

  • Clinical evaluation: History, physical exam
  • Imaging: Colonoscopy, ultrasound, MRI, CT
  • Laboratory tests: Hormone levels, tumor markers
  • Histopathology: Biopsy confirms diagnosis

Treatment and Management[edit]

Treatment varies by adenoma type and risk factors:

  • Observation: Small, asymptomatic adenomas
  • Endoscopic removal: Colorectal polyps
  • Surgical excision: Large or high-risk adenomas
  • Medical therapy: Hormone-suppressing medications for pituitary and adrenal adenomas

Long-term monitoring is often required due to recurrence risk.

Prognosis[edit]

Prognosis depends on adenoma type and malignant potential:

  • Generally favorable with early detection and treatment
  • High-risk adenomas require ongoing surveillance to prevent cancer progression

Prevention[edit]

Preventive strategies include lifestyle modifications, regular screenings (colonoscopy), genetic counseling, and hormonal regulation.

Gallery[edit]

See also[edit]

External links[edit]

American Cancer Society – Adenomas Genetic and Rare Diseases Information Center (GARD)

Overview of tumors, cancer and oncology
Conditions
Staging/grading
Carcinogenesis
Misc.



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