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Line 1: − + − *Squamous cell carcinomas are the malignant equivalent of the papilloma and may arise anywhere within the [[Oropharynx - Anatomy & Physiology|oropharynx]]. − **Those arising over the tonsil (squamous carcinoma of the tonsil or tonsillar carcinoma) are '''very malignant''', invading adjacent tissues and metastasising early. − **Squamous carcinomas of the tongue (especially in '''cats''') can also behave in a very malignant fashion. Those at more rostral sites, e.g. on the incisor gingivae, are less likely to metastasise early although they may be locally aggressive. − **Squamous cell carcinomas of the [[Oropharynx - Anatomy & Physiology|oropharynx]] in cattle are commonly seen as part of an [[Upper Alimentary Tract Carcinoma Complex|upper alimentary tract carcinoma complex]]. − * Squamous cell carcinoma is thought to develop from papillomas in cattle in association with ingested carcinogens in bracken fern. + + + + + + + + + + + Line 13:
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[[Image:oral squamous cell carcinoma.jpg|right|thumb|125px|<small><center>'''Oral squamous cell carcinoma'''. Courtesy of T. Scase</center></small>]] neoplastic
[[Image:oral squamous cell carcinoma.jpg|right|thumb|125px|<small><center>'''Oral squamous cell carcinoma'''. Courtesy of T. Scase</center></small>]]
[[Image:cowpap1.gif|right|thumb|100px|<small><center>Papilloma and Squamous Cell Carninoma of Epiglottis (Courtesy of Alun Williams (RVC))</center></small>]]
[[Image:cowpap1.gif|right|thumb|100px|<small><center>Papilloma and Squamous Cell Carninoma of Epiglottis (Courtesy of Alun Williams (RVC))</center></small>]]
Squamous cell carcinomas are the malignant equivalent of the papilloma and may arise anywhere within the [[Oropharynx - Anatomy & Physiology|oropharynx]]. They are common in the cat, horse and cow. They are most likely to develop in non-pigmented areas of the skin.
The level of malignancy is often related to the location of the neoplasm. Those arising over the tonsil (squamous carcinoma of the tonsil or tonsillar carcinoma) are '''very malignant''', invading adjacent tissues and metastasising early. Squamous carcinomas of the tongue (especially in '''cats''') can also behave in a very malignant fashion. Those at more rostral sites, e.g. on the incisor gingivae, are less likely to metastasise early although they may be locally aggressive.
==Cattle==
As mentioned, squamous cell carcinomas are most likely to develop on non-pigmented areas of skin such as the eyelids. There is thought to be an association between the ingestion of bracken fern carcinogens and the malignant transformation of papillomas to squamous cell carcinomas in cattle.
*Squamous cell carcinomas of the [[Oropharynx - Anatomy & Physiology|oropharynx]] in cattle are commonly seen as part of an [[Upper Alimentary Tract Carcinoma Complex|upper alimentary tract carcinoma complex]].
==Cat==
*Squamous cell carcinomas of the [[Oesophagus - Anatomy & Physiology|oesophagus]] are occasionally seen in other species, notably in the cat, where the tumour tends to infiltrate around the oesophageal wall resulting in a “'''ring carcinoma'''”.
*Squamous cell carcinomas of the [[Oesophagus - Anatomy & Physiology|oesophagus]] are occasionally seen in other species, notably in the cat, where the tumour tends to infiltrate around the oesophageal wall resulting in a “'''ring carcinoma'''”.
*Forms part of [[Upper Alimentary Tract Carcinoma Complex]]
*Forms part of [[Upper Alimentary Tract Carcinoma Complex]]
==Horse==
* The most common gastric tumour in the horse.
* The most common gastric tumour in the horse.
[[Category:Respiratory System - Hyperplastic/Neoplastic Pathology]]
[[Category:Respiratory System - Hyperplastic/Neoplastic Pathology]]
[[Category:Neoplasia]]
[[Category:Neoplasia]]
[[Category: To Do - Siobhan Brade]]