Difference between revisions of "Malassezia pachydermidis"

Revision as of 14:19, 29 April 2010

Malassezia pachydermidis - Copyright Professor Andrew N. Rycroft, BSc, PHD, C. Biol.F.I.Biol., FRCPath

Normally present in oily areas on the external ear canal and skin in dogs
- Some strains have been recovered from the ear canal of cats

Bottle-shaped, small budding cells, non-mycelial

Gram stain shows purple yeast cells with a very wide base

Grows on Sabouraud's Dextrose agar in 2 weeks of incubation at room temperature

Greenish discolouration on blood agar

Clinical disease may cause yeast to proliferate and cause infection

Grossly:
- Regional lesions: muzzle, ears, interdigital, perianal
- Or generalised disease
- Erythematous, hyperpigmented, lichenified and scaly lesions with alopecia

Microscopically:
- hyperkeratosis, parakeratosis
- Spongiotic pustular dermatitis
- Acanthosis
- Organisms are usually present- minimum 3-5 yeasts per high-power field must be found to imply cause of disease

Malassezia pachydermis in malassezia dermatitis

@@ Line 1: / Line 1: @@
 [[Image:Malassezia pachydermidis.jpg|thumb|right|150px|''Malassezia pachydermidis'' - Copyright Professor Andrew N. Rycroft, BSc, PHD, C. Biol.F.I.Biol., FRCPath]]
+*Normally present in oily areas on the external [[Ear - Anatomy & Physiology|ear]] canal and [[Skin - Anatomy & Physiology|skin]] in dogs
+**Some strains have been recovered from the [[Ear - Anatomy & Physiology|ear]] canal of cats
-''Malassezia pachydermidis'' is commonly found on healthy skin and mucosa.  It is an opportunistic pathogen of both cats and dogs, and during infection it may increase 100-10000 fold on the skin.  It is most commonly recovered from the ear, anus, and the paws.
+*Bottle-shaped, small budding cells, non-mycelial
-Some breeds are more predisposed than others, with Dachshunds and Cocker spaniels amongst the most commonly seen.  ''M. pachydermidis'' is seen concurrently with a ''Staphylococcus intermedius'' infection.
+*Gram stain shows purple yeast cells with a very wide base
-Hot, humid conditions favour the development of the infection.
+*Grows on Sabouraud's Dextrose agar in 2 weeks of incubation at room temperature
-''M. Pachydermatitis'' is bottle-shaped, and non-mycelial.
+*Greenish discolouration on blood agar
-Gram stain shows purple yeast cells with a very wide base, and has a greenish discolouration on blood agar.
+*Clinical disease may cause yeast to proliferate and cause infection
-Causes [[Malassezia Dermatitis]]
+*Grossly:
+**Regional lesions: muzzle, [[Ear - Anatomy & Physiology|ears]], interdigital, perianal
+**Or generalised disease
+**Erythematous, hyperpigmented, [[Skin Glossary - Pathology|lichenified]] and scaly lesions with alopecia
+*Microscopically:
+**[[Skin Glossary - Pathology|hyperkeratosis, parakeratosis]]
+**Spongiotic pustular dermatitis
+**[[Skin Glossary - Pathology|Acanthosis]]
+**Organisms are usually present- minimum 3-5 yeasts per high-power field must be found to imply cause of disease
-{{unfinished}}
+*''Malassezia pachydermis'' in [[Mycotic skin infections - Pathology#Malassezia dermatitis|malassezia dermatitis]][[Category:Yeast-like_Fungi]]
-[[Category:Yeast-like Fungi]]
-[[Category:To Do - Fungi]]

Difference between revisions of "Malassezia pachydermidis"

Revision as of 14:19, 29 April 2010

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