Term
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Definition
direct result of underlying disease process
most important diagnostically |
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Term
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Definition
evolve from primary lesions (self trauma, etc)
less important diagnostically |
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Term
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Definition
circumscribed area of discoloration up to 1 cm in diameter
flat not raised |
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Term
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Definition
macule over 1 cm in diameter
flat not raised |
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Term
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Definition
| small <1cm solid elevation of the skin |
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Term
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Definition
| a larger, flat topped elevation formed by the extension of coalition of papules |
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Term
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Definition
| a circumscribed, solid elevation >1cm that extends into the deep layers |
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Term
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Definition
| a large mass (neoplasia implied_ that may involve any structure of the skin or subcutis |
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Term
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Definition
| an epithelial lined cavity containing fluid or solid material |
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Term
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Definition
| a well circumscribed <1cm elevation of the epidermis filled with clear fluid |
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Term
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Definition
| a vesicle grater than 1 cm in diameter |
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Term
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Definition
| a small circumscribed, pus (suppurative inflammation) filled elevation of the epidermis |
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Term
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Definition
| a well demarcated fluctuant lesion resulting from dermal/subcutaneous pus |
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Term
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Definition
| accumulation of loose fragments of cornified skin |
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Term
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Definition
| an accumulation of dried exudate, blood/serum, scale or medication adherent to the skin surface |
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Term
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Definition
| crusts that spread outward in a circular fashion |
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Term
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Definition
| a dilated hair follicle filled with cornified cells and sebaceous material |
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Term
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Definition
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Term
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Definition
| decreased amount of or absence of hair |
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Term
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Definition
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Term
| Hypertrichosis (hirsutism) |
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Definition
| a more than normal amount of hair |
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Term
|
Definition
| due to inflammation or vasodilation |
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Term
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Definition
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Term
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Definition
| thickening and hardening of the skin with exaggeration of superficial markings |
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Term
|
Definition
hemorrhage
purpura, petechia, echhymosis |
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Term
|
Definition
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Term
|
Definition
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Term
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Definition
shallow epidermal defect
doesn't penetrate the basement membrane |
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Term
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Definition
| break in the epidermis with exposure of the dermis |
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Term
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Definition
| an area of fibrous tissue that has replaced the damaged dermis and/or subcutis |
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Term
| Perivascular/Interstitial Dermatitis |
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Definition
inflammatory reaction centered on the superficial and/or deep dermal vessels
edema and perivascular accumulation of inflammatory cells |
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Term
| Spongiotic Perivascular Dermatitis |
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Definition
| inflammatory reaction centered on the superficial and/or deep dermal vessels along with edema between keratinocytes |
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Term
| Hyperplastic Perivascular Dermatitis |
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Definition
| inflammatory reaction centered on the superficial and/or deep dermal vessels along with prominent epidermal hyperplasia |
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Term
| Causes of Perivascular/Interstitial Dermatitis |
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Definition
| hypersensivitiy reactions |
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Term
| Causes of Spongiotic Perivascular Dermatitis |
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Definition
| hypersensitivities, contact dermatitis, ectoparasitism, dermatophytosis, malasseziasis |
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Term
| Causes of Causes of Hyperplastic Perivascular Dermatitis |
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Definition
| chronic hypersensitivity, altered keratinization, lick dermatitis |
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Term
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Definition
| obscuring of the dermoepidermal junction |
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Term
| Causes of Interface Dermatitis |
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Definition
| immune-mediated or autoimmune, drug reactions, viral infections |
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Term
| Inferface Lichemoid Dermatitis |
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Definition
| obscuring of the dermoepidermal junction with infiltration of inflammatory cells in the dermis |
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Term
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Definition
| inflammation and damage to the blood vessel walls |
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Term
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Definition
| infections, immune-mediated diseases |
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Term
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Definition
| discrete clusters of inflammatory cells within the dermis |
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Term
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Definition
| dense diffuse inflammatory cell infiltrate with effacement of normal dermal architecture |
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Term
| Intraepidermal Vesicles or Pustules |
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Definition
| acantholysis, coalescing ballooning degeneration, intense intra/intecellular edema |
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Term
| Subepidermal Vesicles/Pustules |
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Definition
dermoepidermal separation
subepidermal edema and/or cellular infiltration |
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Term
|
Definition
| inflammatory cells surrounding hair follicle |
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Term
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Definition
| inflammatory cells within the wall and/or lumen of the hair follicle |
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Term
|
Definition
| effacement/rupture of hair follicle due to intense inflammation |
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Term
| Causes of Perifolliculitis, Folliculitis, Furunculosis |
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Definition
| bacteria, mites, dermatophytes |
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Term
|
Definition
| Inflammation of the panniculus or hypodermis |
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Term
|
Definition
nutritional, injection, idiopathic, pancreatic induced in cats, blastomycosis
often an extension from nodular or diffuse dermatitis |
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Term
|
Definition
| Adnexal structure atrophy |
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Term
| Causes of Atrophic Dermatitis |
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Definition
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Term
|
Definition
absence of hair follicles and/or abnormal follicular development
present in all domestic species |
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Term
| Causes of Hypotrichosis in Cattle |
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Definition
BVD, pituitary hypoplasia, teratogens
common in German Holstein cows (also get adontia) |
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Term
|
Definition
| plates of compact keratin due to a congenital keratinization disorder |
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Term
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Definition
| Bilateral alopecia in shape of saddle on the dorsal lateral thorax with skin hyperpigmentation |
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Term
| Causes of Cyclical Flank Alopecia |
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Definition
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Term
|
Definition
sun injury
UV-A, UV-B, UV-C and visible light generate free radicals
free radicals cause cell damage and death
mutagenesis of P53 tumor suppressor gene and hyperplasia of keratinocytes |
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Term
|
Definition
sunburn
direct endothelial damage and damage to keratinocytes
release of inflammatory mediators |
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Term
|
Definition
| photodynamic substances in skin are activated by UV-A or visible light |
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Term
| Type I Photosensitization |
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Definition
exogenous origin of photodynamic agents
eating of toxins like St. John's Wort, Buckwheat, Bishop's weed, Spring Parsley |
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Term
| Type II Photosensitization |
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Definition
aberrant heme pigment synthesis
Bovine Congential Porphorya |
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Term
| Type III Photosensitization |
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Definition
failure to remove phylloerythrin from liver damage
Chronic Alfatoxicosis |
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Term
| Type IV Photosensitization |
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Definition
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Term
|
Definition
common in large breed dogs like Lab retriever, Golden retriever, German Shepherd
psychogenic - animal is bored or stressed so it licks itself as a calming mechanism
focal areas of alopecia, erythema, erosion/ulceration |
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