Changes

==''Malassezia pachydermidis''==

==''Malassezia pachydermidis''==

[[Image:Malassezia pachydermidis.jpg|thumb|right|150px|''Malassezia pachydermidis'' - Copyright Professor Andrew N. Rycroft, BSc, PHD, C. Biol.F.I.Biol., FRCPath]]

[[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 [[The Ear - Anatomy & Physiology|ear]] canal and [[Skin - Anatomy & Physiology|skin]] in dogs

 

**Some strains have been recovered from the [[The Ear - Anatomy & Physiology|ear]] canal of cats

*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

*Bottle-shaped, small budding cells, non-mycelial

*Gram stain shows purple yeast cells with a very wide base

*Gram stain shows purple yeast cells with a very wide base

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

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

*Greenish discolouration on blood agar

*Greenish discolouration on blood agar

*Clinical disease may cause yeast to proliferate and cause infection

*Clinical disease may cause yeast to proliferate and cause infection

*Grossly:

*Grossly:

**Regional lesions: muzzle, ears, interdigital, perianal

**Regional lesions: muzzle, [[The Ear - Anatomy & Physiology|ears]], interdigital, perianal

**Or generalised disease

**Or generalised disease

**Erythematous, hyperpigmented, [[Skin Glossary - Pathology|lichenified]] and scaly lesions with alopecia

**Erythematous, hyperpigmented, [[Skin Glossary - Pathology|lichenified]] and scaly lesions with alopecia

*Microscopically:

*Microscopically:

**[[Skin Glossary - Pathology|hyperkeratosis, parakeratosis]]

**[[Skin Glossary - Pathology|hyperkeratosis, parakeratosis]]

**Spongiotic pustular dermatitis

**Spongiotic pustular dermatitis

**[[Skin Glossary - Pathology|Acanthosis]]

**[[Skin Glossary - Pathology|Acanthosis]]

**Organisms are usually present, minimum 3-5 yeasts per high-power field must be found to imply cause of disease

**Organisms are usually present- minimum 3-5 yeasts per high-power field must be found to imply cause of disease

*''Malassezia pachydermis'' in [[Mycotic skin infections - Pathology#Malassezia dermatitis|malassezia dermatitis]]

*''Malassezia pachydermis'' in [[Mycotic skin infections - Pathology#Malassezia dermatitis|malassezia dermatitis]]