Difference between revisions of "Adenocarcinoma"
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− | + | [[Image:adenocarcinoma stomach histopath2.jpg|thumb|right|100px|Adenocarcinoma- histological (Courtesy of BioMed Image Archive)]] | |
− | [[Image:adenocarcinoma stomach histopath2.jpg|thumb|right| | + | * Adenocarcinoma is the most common gastric neoplasm in small animals. |
− | + | ** This is a tumour of the mucosal epithelium. | |
− | Adenocarcinoma is the most common gastric neoplasm in small animals. | + | * These are genreally found in the fundus (particularly along the lesser curvature), and in the pylorus. |
− | # A diffuse infiltration of gastric mucosa by neoplastic glandular epithelial cells. | + | * There are two main internal appearances of gastric adenocarcinoma, both of which show thickened, oedematous, pale and firm tissue:[[Image:adenocarcinoma stomach.jpg|thumb|right|100px|Adenocarcinoma- gross (Courtesy of BioMed Image Archive)]] |
− | #* Causes a diffuse rugal thickening. | + | *# A diffuse infiltration of gastric mucosa by neoplastic glandular epithelial cells. |
− | # A more solitary lesion that is seen as a thick plaque-like lesion | + | *#* Causes a diffuse rugal thickening. |
− | #* Generally has a central erosion/ulceration of the tumour tissue. | + | *# A more solitary lesion that is seen as a thick plaque-like lesion |
− | #* Distinguishable from a peptic ulcer as the edges of the eroded area are raised and thickened (tumour tissue). | + | *#* Generally has a central erosion/ulceration of the tumour tissue. |
+ | *#** Distinguishable from a peptic ulcer as the edges of the eroded area are raised and thickened (tumour tissue). | ||
+ | * The external appearance of an affected [[Forestomach - Anatomy & Physiology|stomach]] can include thickening of the draining lymphoid vessels due to tumour infiltration ('cording of the lymphatics') and evidence of a scirrhous reaction to the carcinoma. | ||
+ | * Adenocarcinomas are locally aggressive and spread via the lymphatics to the [[Lymph Nodes - Anatomy & Physiology|lymph nodes]], lung, [[Liver - Anatomy & Physiology|liver]] and [[Adrenal Glands - Anatomy & Physiology|adrenal glands]]. | ||
− | + | ==Intestinal== | |
− | + | * An '''intestinal adenocarcinoma''' is a malignancy of epithelial cells from the intestinal mucosa. | |
− | [[ | + | * Found in both the [[Small Intestine - Anatomy & Physiology|small]] and [[Large Intestine - Anatomy & Physiology|large intestines]] |
+ | ** Common in the canine [[Rectum - Anatomy & Physiology|rectum]]. | ||
+ | * Species affected: | ||
+ | ** Fairly common in dog and cat. | ||
+ | ** Seen related to bracken ingestion in the older sheep. | ||
+ | ** Occasionally occur in horses. | ||
+ | * These tumours usually grow away from the mucosa, down through the muscularis mucosae and into the submucosa, muscular layers and the serosa. | ||
+ | ** They may, however, project into the lumen. | ||
+ | * Intestinal adeocarcinomas may take an annular form. | ||
+ | ** This may result in stenosis of lumen | ||
+ | *** Muscle proximal to the lesion becomes hypertrophied and dilated. | ||
+ | * Spread may be | ||
+ | *# Via the lympahtics. | ||
+ | *#* To the lymph nodes, lung and [[Liver - Anatomy & Physiology|liver]]. | ||
+ | *# Transcoelomic spread | ||
+ | *#* Small, white plaques on serosa and adjacent tissues e.g. diaphragm. | ||
− | ==Perianal | + | ==Tumours of the Perianal Area== |
− | + | ===Adenocarcinomas of the Glands of the Anal Sac (Apocrine Glands)=== | |
− | + | * Apocrine glands are the true anal glands- not to be confused with the anal sacs or the perianal glands. | |
+ | * Much less common than intestinal adenocarcinoma. | ||
+ | * Commoner in bitches than dogs. | ||
+ | * Can be bilateral. | ||
+ | * Consequences: | ||
+ | ** May cause local problems. | ||
+ | ** May metastasise. | ||
+ | ** Often secrete a parahormone-like substance to cause paraneoplastic syndrome. | ||
+ | *** This can arise even when the primary tumour is very small. | ||
+ | *** Results in bone resorption and hypercalcaemia, | ||
+ | **** In turn can cause renal failure. which in turn can cause renal failure. | ||
− | + | See [[Anal Sac Adenocarcinoma - WikiClinical]] | |
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− | + | [[Category:Stomach and Abomasum - Proliferative Pathology]][[Category:Dog]][[Category:Cat]] | |
− | + | [[Category:Intestines_-_Proliferative_Pathology]] | |
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Revision as of 19:44, 6 June 2010
- Adenocarcinoma is the most common gastric neoplasm in small animals.
- This is a tumour of the mucosal epithelium.
- These are genreally found in the fundus (particularly along the lesser curvature), and in the pylorus.
- There are two main internal appearances of gastric adenocarcinoma, both of which show thickened, oedematous, pale and firm tissue:
- A diffuse infiltration of gastric mucosa by neoplastic glandular epithelial cells.
- Causes a diffuse rugal thickening.
- A more solitary lesion that is seen as a thick plaque-like lesion
- Generally has a central erosion/ulceration of the tumour tissue.
- Distinguishable from a peptic ulcer as the edges of the eroded area are raised and thickened (tumour tissue).
- Generally has a central erosion/ulceration of the tumour tissue.
- A diffuse infiltration of gastric mucosa by neoplastic glandular epithelial cells.
- The external appearance of an affected stomach can include thickening of the draining lymphoid vessels due to tumour infiltration ('cording of the lymphatics') and evidence of a scirrhous reaction to the carcinoma.
- Adenocarcinomas are locally aggressive and spread via the lymphatics to the lymph nodes, lung, liver and adrenal glands.
Intestinal
- An intestinal adenocarcinoma is a malignancy of epithelial cells from the intestinal mucosa.
- Found in both the small and large intestines
- Common in the canine rectum.
- Species affected:
- Fairly common in dog and cat.
- Seen related to bracken ingestion in the older sheep.
- Occasionally occur in horses.
- These tumours usually grow away from the mucosa, down through the muscularis mucosae and into the submucosa, muscular layers and the serosa.
- They may, however, project into the lumen.
- Intestinal adeocarcinomas may take an annular form.
- This may result in stenosis of lumen
- Muscle proximal to the lesion becomes hypertrophied and dilated.
- This may result in stenosis of lumen
- Spread may be
- Via the lympahtics.
- To the lymph nodes, lung and liver.
- Transcoelomic spread
- Small, white plaques on serosa and adjacent tissues e.g. diaphragm.
- Via the lympahtics.
Tumours of the Perianal Area
Adenocarcinomas of the Glands of the Anal Sac (Apocrine Glands)
- Apocrine glands are the true anal glands- not to be confused with the anal sacs or the perianal glands.
- Much less common than intestinal adenocarcinoma.
- Commoner in bitches than dogs.
- Can be bilateral.
- Consequences:
- May cause local problems.
- May metastasise.
- Often secrete a parahormone-like substance to cause paraneoplastic syndrome.
- This can arise even when the primary tumour is very small.
- Results in bone resorption and hypercalcaemia,
- In turn can cause renal failure. which in turn can cause renal failure.