Difference between revisions of "Flea Allergic Dermatitis"

Revision as of 14:21, 4 August 2010

Also known as:

Flea Allergy Dermatitis, FAD

Occurs in cats and dogs mainly
Irritation caused by enzymes, anticoagulants and histamine-like substances
Hypersensitivity to flea saliva may develop
Young or small animals may suffer from aneamia
Lesions normally in dorsolumbosacral region, caudomedial thighs, ventral abdomen, flank, neck (cats)
Grossly:
- Red papules and secondary excoriations
Usually involves Type I reaction and Type IV reaction and cutaneous basophil hypersensitivity
Mainly dorsolumbosacral area involved, abdomen, caudomedial thighs, flanks, neck of cats
Secondary trauma is self-inflicted
Grossly:
- Papular dermatitis
- Secondary excoriations
- Alopecic nodule if chronic
Microscopically:
- Hyperplastic superficial perivascular dermatitis
- Oedema, mast cells, basophils, eosinophils, lymphocytes, histiocytes
- Fibropruritic nodules covered by hyperplastic epidermis

@@ Line 13: / Line 13: @@
 *Grossly:
 **Red papules and secondary excoriations
+*Usually involves [[Skin Immunologic - Pathology#Type I  reactions|Type I reaction]] and [[Skin Immunologic - Pathology#Type IV  reactions|Type IV reaction]] and cutaneous basophil hypersensitivity
+*Mainly  dorsolumbosacral area involved, abdomen, caudomedial thighs, flanks,  neck of cats
+*Secondary trauma is self-inflicted
+*Grossly:
+**Papular  dermatitis
+**Secondary excoriations
+**Alopecic nodule if  chronic
+*Microscopically:
+**Hyperplastic superficial  perivascular dermatitis
+**Oedema, [[Mast Cells|mast cells]],  [[Basophils|basophils]], [[Eosinophils|eosinophils]],  [[Lymphocytes|lymphocytes]], histiocytes
+**Fibropruritic nodules  covered by hyperplastic epidermis
 ==Signalment==