Difference between revisions of "Deep Pyoderma"

Revision as of 19:10, 21 February 2011

Less common than superficial pyoderma
Occurs mainly in dogs
Affects infundibulum, isthmic portion of hair follicles and surrounding dermis and subcutis
Heals with scarring
Local lymph nodes are often affected
Often secondary to immunosuppression, follicular hyperkeratosis or demodicosis
May also be a sequele to superficial pyoderma
Grossly:
- Crusted papules, pustules, alopecia, abscesses, nodules, fistulas, ulcers, haemorrhagic bullae
- In dogs may look similar to pyotraumatic dermatitis
Microscopically:
- Pyogranulomatous folliculitis and furunculosis
- Nodular or diffuse dermatitis
- Panniculitis
May involve a foreign bodey reaction to follicular contents and draining sinuses develop
If chronic, scarring and loss of adnexa
Bacteria often isolated include Staphylococcus spp., especially S. intermedius in dogs, Streptococcus spp., Corynebacterium pseudotuberculosis, Pseudomonas, Pasteurella, Proteus, E.coli

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 ====[[Subcutaneous Abscesses]]====
-*Purulent exudate within dermis and subcutis
-*Commonly occurs in cats due to contamination of penetrating wounds
-*Surrounding wall of collagen and fibroblasts may develop
-*Common bacteria (often normal mouth flora)
-**[[Pasteurella multocida|''Pasteurella multocida'']], [[Fusobacterium necrophorum|''Fusobacterium'' spp.]], [[:Category:Streptococcus species|beta - haemolytic streptococci]], [[Bacteroides|''Bacteroides'']]
 [[Category:Integumentary System - Bacterial Infections]]