fungus-2.ppt

8/9/2019 Fungus-2.ppt

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Selling a Product or Service

FUNGAL

SKIN

INFECTIONS

II

IHAB YOUNIS, M.D.


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B. Cutaneous mycoses

Infections that extend deeper intothe epidermis, as well as hair andnail and caused by dermatophytes

!"inea capitis!"inea corporis

!"inea manus

!"inea cruris!"inea pedis

!"inea unguium


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Tinea capitis

#tymology $. %caput& head


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"inea capitis is the most commonpediatric dermatophyte infectionworldwide

"he age predilection is believed toresult from the presence ofMalassezia furfurwhich is part ofnormal 'ora, and from the fungistatic

properties of fatty acids of short andmedium chains in postpubertal sebum


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Hair invasion bydermatophytes

#ctothrix invasion (rthroconidia on theexterior of the hair shaft. "he cuticle ofthe hair is destroyed and infected hairs'uoresce under a )ood*s lamp

#ndothrix hair invasion (rthroconidiawithin the hair shaft only. "he cuticle ofthe hair remains intact and infected

hairs do not 'uoresce under a )ood*slamp


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Ectothrix

Endothrix

Hair

Conidia

Hair

Conidia


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Types


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1-Scaly type:

#rythematous

papule+s around the hair shaft appear initially

Subse-uently, one or

several patches of scaly alopecia are seen where

the hairs are broen /ust

above the level of scalp

"he hair loos lusterless

as it is covered with

arthrospores


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2-Black dots type:

It is an endothrix infection,

so hairs become notably

fragile and brea easily at

the level of the scalp "he rest of the infected

follicle loos lie

0blac dots0. 1ariabledegrees of scaling and

in'amm2ation are seen


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3-Kerion :

Scattered painful pruritic pustularfolliculitis generally associated withregional lymphadenopathy and evenfever

In about 324 5, boggynodules studded with

broen hairs and purulent

sticy material 0erion0

appear

Scarring alopecia develops

subse-uently


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-!avus :"tymolo#y:$. honeycomb

6ense masses of mycelium

and epithelial debris forming yellowish cup2shaped crusts

called scutula

"he scutulum develops

at the surface of a hair

follicle with the shaft in

the center of the raised

lesion


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7emoval of these crusts reveals anoo8ing,moist, red base

(fter a period of years, atrophy ofthe sin occurs leaving a cicatricial

alopecia and scarring


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Tinea corporis $circinata%


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"tiolo#y

(9ects the glabrous sin +ie, sinregions except the scalp, groin, palms,and soles

T rubrumis the most commoninfectious agent in the world

:ay result from contact with infectedhumans, animals, or inanimate ob/ects+eg contact with sports facilities


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ClinicallyPatients can be asymptomatic or

pruriticBegins as an erythematous, scaly

pla-ue that may rapidly worsen

and enlarge;entral

resolution

causes the

lesion to

be annular


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Scales, crusts, vesicles, and papulesoften develop, especially in theadvancing border


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Infections due to 8oophilic or

geophilic dermatophytes mayproduce a more intense

in'ammatory

response thanthose caused

by anthropophilic

fungi


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:a/occhi granuloma manifests asperifollicular, granulomatous

nodules typically in a

distinct location, which is

the lower two thirds of the

leg in females


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"inea imbricata +Imbricate

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