Pathology
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Atlas of dermatopathology
Josef Feit, Hana Jedličková, Günter Burg, Luděk Matyska, Spasoje Radovanovic et al.
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+ Introduction
+ Literature
+ Support
+ Skin biopsy
+ Non-tumorous skin diseases
+ Skin tumors
+ Cysts of the skin and subcutis
+ Soft tissue lesions
+ Some lesions of the oral cavity
+ Dermatovenerology
+ Collection of histological slides by prof. Günter Burg
+ Collection of histological slides by prof. Werner Kempf
+ Collection of histological slides of dr. Ram Chandra Adhikari
Allergic contact dermatitis, acute
Etiology, pathogenesis
  • T-cell mediated type IV. allergic response
  • antigens from outside, e.g. some plants
  • hapten binds to a carrier on the membrane of Langerhans cells, then is presented to T lymphocytes
  • relatively dose independent
  • lesions develop in areas of contact
Clinical signs
  • it takes 7 days to several years to become sensitized, upon reexposure eczema appears within 48 hours
  • in the beginning only the place of contact, lately generalized lesions
  • Acute allergic contact dermatitis: 1. erythema, 2. papules and/or vesicles, 3. exudation, 4. crusts, 5. scaling
  • Chronic allergic contact dermatitis: erythema, papules, lichenification, scaling
  • pruritus

Contact non allergic dermatitis is caused by various chemical irritants; dose and concentration dependent.

Acute dermatitis (1004)

Contact dermatitis (nickel) (1019)

Pictures

Acute photoallergic contact dermatitis: Eczem dermatitis, Clinical picture (718)

Contact allergic dermatitis acute with vesicles: Eczem dermatitis, Clinical picture (1004)

Contact allergic dermatitis: Eczem dermatitis, Clinical picture (1014)

Contact allergic dermatitis: Eczem dermatitis, Clinical picture (1015)

Contact allergic dermatitis caused by eye drops: Eczem dermatitis, Clinical picture (1016)

Contact allergic dermatitis caused by eye drops: Eczem dermatitis, Clinical picture (1017)

Contact allergic dermatitis: Eczem dermatitis, Clinical picture (1018)

Contact allergic dermatitis, nickel: Eczem dermatitis, Clinical picture (1019)

Contact allergic dermatitis around the leg ulcer with dissemination: Eczem dermatitis, Clinical picture (1024)

Hyperkeratotic eczema of the foot: Eczem dermatitis, Clinical picture (1026)

Contact irritative dermatitis caused by antiseptic agent, leg: Contact allergic dermatitis acute, Clinical picture (3034) Contact allergic dermatitis acute, Clinical picture (3035) Contact allergic dermatitis acute, Clinical picture (3039)

Contact dermatitis, watch: Contact allergic dermatitis acute, Clinical picture (3023)

Contact dermatitis caused by plaster, axilla: Contact allergic dermatitis acute, Clinical picture (3024)

Contact dermatitis caused by metal of the belt: Contact allergic dermatitis acute, Clinical picture (3025) Contact allergic dermatitis acute, Clinical picture (3026) Contact allergic dermatitis acute, Clinical picture (3027)

Contact dermatitis (chrome, cobalt): Contact allergic dermatitis acute, Clinical picture (3028) Contact allergic dermatitis acute, Clinical picture (3029) Contact allergic dermatitis acute, Clinical picture (3030)

Contact dermatitis, hands: Contact allergic dermatitis acute, Clinical picture (3031) Contact allergic dermatitis acute, Clinical picture (3032) Contact allergic dermatitis acute, Clinical picture (3033)

Contact dermatitis caused by plaster, leg: Contact allergic dermatitis acute, Clinical picture (3040) Contact allergic dermatitis acute, Clinical picture (3041)

Contact dermatitis caused by plaster, patch test: Contact allergic dermatitis acute, Clinical picture (3042) Contact allergic dermatitis acute, Clinical picture (3043)

Contact dermatitis, leg: Contact allergic dermatitis acute, Clinical picture (3044) Contact allergic dermatitis acute, Clinical picture (3045)

Contact dermatitis, abdomen: Chronic eczem dermatitis allergic contact, Clinical picture (5560) Chronic eczem dermatitis allergic contact, Clinical picture (5561)

Contact dermatitis, metallic string: Contact eczema in place of metal string, Clinical picture (5974)

Acute contact dermatitis: Acute contact dermatitis, Clinical picture (6348)

Further examples of allergic contact dermatitis:

Histology

Spongiotic intraepidermal vesicles, spongiosis; in urticarial lesions dermal edema and perivascular mixed infiltrate.

Chronic lesions are characterized by plaques of acanthosis, hyperkeratosis, increased granular layer and fibrosis of the upper corium.

Etiology can be often verified by patch tests.

Contact dermatitis (1247)