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Superficial mycoses affect which layers of the skin?
Stratum corneum
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Superficial mycoses affect which layers of the hair?
Cuticle
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Found areas of the body rich in sebaceous glands
Pitynasis versicolor
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Lesion: hypopigmented or hypopigmented macular lesion that scale readily giving it a chakly appearance; occurs most frequently on the upper torso of the body
Pitynasis versicolor
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Etiologic agent: Malssezia furfur
Pitynasis versicolor
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Clinical diagnosis: microscopic examination of skin scrapings; "spaghetti and meatballs"
Pitynasis versicolor
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Appearances; cultures are not routinely done to confirm diagnosis
Pitynasis versicolor
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Clinical feature: lesions are described as well demarcated gray to black macular areas found on the palmar and plantar areas of the stratum corneum
Tinea nigra
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Etiologic agent: Exiophilia werneckii
Tinea nigra
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Clinical diagnosis: septate hyphae and budding yeast cells
Tinea nigra
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Clinical feature: hard black nodules found along the hairshaft; affects scalp hair
Black piedra
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Etiologic agent: Piedraia hortae
Black piedra
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Clinical diagnosis: asci and ascospores
Black piedra
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There is development of cream soft pasty growth along the infected hair shaft; affects the hairs of the axilla, bread, moustache, pubic and scalp
White piedra
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Etiologic agent: Trichosporon beigeli
White piedra
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Clinical diagnosis: sleeve-like collarette around the hair shaft
White piedra
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3 Genera of cutaneous myscoses
- Trichophyton
- Microsporum
- Epidermophyton
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Infects the skin, hair and nails
More micronidia than macronidia are formed
Tricophyton
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Grape-like clusters of micronidia on terminal branch
T. mentagrophytes
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Teardrop shaped micronidia
T. rubrum
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Clavate micronidia
T. tonsurans
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Favic chandelier
T. schoenleini
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Infects the skin and hair only
More macronidia than micronidia are formed
Microsporum
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Macronidia have curved or hooked spiny tip
M. canis
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Thinner walled macronidia
M. gypseum
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Thick walled chlamydospores
M. audouinii
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Invade the skin and nails
E. floccosum
Fuseaux in banana branch
Epidermophyton
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Foot; infected with trichophyton and epidermophyton
Tinea pedis
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Skin of the body; infected with Microsporum, Trichophyton, and Epidermophyton
Tinea corporis
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Groin; infected with Trichophyton and Epidermophyton
Tinea cruris
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Scalp and hair; Endothrix infection - spores seen inside hair shaft; Trichophyton spp
Ecthothrix infection - spores surrounding the hair shaft; Microsporum spp.
Tinea capitis
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Beard; infected with Trichophyton
Tinea barbae
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Hair infection caused by T. schoenleine; has a waxy mass of hyphal elements surrouding the base of the hair follicle at the scalp line. Microscopic examination of the hair reveals degenerated hyphal elements coursing throughout the hair shaft. Such hairs are called favic and are diagnostic of the infection
Favus
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Dissolves skin, nail scrapings
KOH prep
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With calcoflour white prep, you will see branching septate, hyphal elements in these tissues
Skin, nail
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With calcoflour white prep, you will see ectothrix or endothrix infection in this tissue
Hair
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Agar used for culture
Sabouraud's dextrose agar (at room temperature)
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