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Skin-nontumor / Clinical Dermatology

Infestations

Demodex


Reviewer: Mowafak Hamodat, MB.CH.B, MSc., FRCPC, Eastern Health, St. Johns, Canada (see Reviewers page)
Revised: 19 June 2011, last major update June 2011
Copyright: (c) 2002-2011, PathologyOutlines.com, Inc.

Description
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● Mites are commonly present in inflamed follicles, but are usually nonpathogenic (Wikipedia)
● Common in dogs

Epidemiology
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● Common in basal cell carcinomas removed from the eyelids

Micro description
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● Follicular dilatation, the presence of dense homogenous eosinophilic material surrounding the mites, folliculitis and perifollicular chronic inflammation
● Often is a granulomatous reaction to extra-follicular Demodex, usually in granulomatous or pustular rosacea
● May see telangiectasia of superficial vessels, perifollicular granuloma and mild perivascular chronic inflammation

Micro images
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Various images

End of Skin-nontumor / Clinical Dermatology > Infestations > Demodex


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