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Skin Environmental - Pathology (view source)

Revision as of 22:21, 6 June 2010

871 bytes removed , 22:21, 6 June 2010

→‎Photosensitisation

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**Dogs may develop actinic [[Skin Glossary - Pathology|comedones]]

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===~~Photosensitisation===~~

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===[[Photosensitisation]]===

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*'''Primary'''

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**Ingestion of photodynamic substance from plants (''Hypericum perforatum'' and ''Fagopyrum sagittatum'' - buckwheat) or fungal contaminants

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**Induced by drug administration - phenothiazines, tetracyclines, thiazides, sulphonamides

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*'''Abnormal porphyrin metabolism'''

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**Bovine congenital porphyria

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**Bovine erythropoeitic protoporphyria

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*[[Photosensitisation~~|'''Hepatogenous'''~~]]

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**Impaired excretion of phylloerythrin (chlorophyl metabolism product) due to hepatic disease

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**[[Liver Biliary Tract - Pathology#Obstruction|Biliary obstruction]]

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**Inherited defects

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**Hepatic injury due to toxic plants or fungal contaminants, chemicals or some infectious agents

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*Grossly:

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**In areas lacking hair or pigment

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**Erythema, oedema -> blisters, exudation, necrosis, sloughing or keratitis

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*Microscopically:

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**Subepidermal vesicles

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**Ulceration

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**Secondary infection

===Photoenhanced dermatoses===

Bara

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Skin Environmental - Pathology (view source)

Revision as of 22:21, 6 June 2010

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