Difference between revisions of "Adenoma"
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[[Category:Liver, Primary Tumours]] | [[Category:Liver, Primary Tumours]] | ||
[[Category:Pancreas_-_Hyperplastic_and_Neoplastic_Pathology]] | [[Category:Pancreas_-_Hyperplastic_and_Neoplastic_Pathology]] | ||
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[[Category:Neoplasia]] | [[Category:Neoplasia]] |
Revision as of 11:56, 1 July 2010
- Adenomas are unusual but may develop in oropharyngeal salivary tissue.
Intestinal adenoma
- An adenoma is a growth of glandular origin.
- Intestinal adenomas are found in both the small and large intestines.
- Intestinal adenomas usually grow into the lumen.
- These growths are bengin and polyp-like.
Tumours of the Perianal Area
Hepatoid Gland Tumours (Perianal Adenomas)
* Affect the dog.
- Arise from the solid, modified sebaceous circumanal glands.
- Common in ageing entire males.
- Lesions range from hyperplasia to true adenomas (benign).
- These low grade lesions are under hormonal control.
- Castration/ administation of oestrogens or anti-androgens causes reduction in size.
- These low grade lesions are under hormonal control.
- Occasionally hepatoid carcinomas (malignant) arise in affected males
- Outwith hormonal control.
- Hepatoid gland tumours occur rarely in bitches.
- Are commonly malignant.
- Hepatoid glands are also found at the tail head, prepuce and occasionally other skin sites.
- Hepatoid tumours can also arise in these areas.
Hepatocytic
- seen mostly in sheep and cattle
Gross
- a single, pale, soft, often large nodule
- well demarcated from adjacent tissue, often with a noticeable capsule
Microscopically
- normal hepatocytic appearance
- no portal tracts within the mass
- a capsule surrounds the growth
Cholangiocellular - bile duct
- very rare
- reported in dogs and cats
Pancreatic
Image of multifocal pancreatic adenoma in a dog from Cornell Veterinary Medicine
- Very rare
- May be difficult to distinguish from nodular hyperplasia
- Single and larger nodules than normal pancreas