Cases reported "Dermatitis, Contact"

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1/4. Occupational allergic contact dermatitis due to leatherleaf fern Arachniodes adiantiformis (Forst) Tindale.

    Leatherleaf fern has been imported from the united states, honduras and puerto rico to the Federal Republic of germany since 1966 and cultivated in germany since 1970/71. It is slowly displacing the floral arrangements with asparagus used until now as filler and background material. This change is due primarily to its better keeping quality. Continuous contact with the leatherleaf fern induced an allergic contact dermatitis of the palms and fingers in a female florist. patch tests with the leaf revealed the allergic origin of the dermatitis. Five fractions of a chromatographically separated extract of the fern were tested on sensitized guinea-pigs and on the patient. Only the first fraction gave a positive patch test response. By further separation colourless crystals of the contact allergen could be obtained. Elucidation of the structure is in progress. The sensitizer could only be detected during sporogenesis of the fern, that means when sporecapsules are present on the surface of the leaves.
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ranking = 1
keywords = leaf
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2/4. Gas plant (dictamnus albus) phytophotodermatitis simulating poison ivy.

    A 48-year-old man presented with an itchy rash that resembled superficial burns or cane marks on his left forearm; similar lesions had appeared every summer for 5 years. Poison ivy dermatitis had been the initial diagnosis, but the patient knew that this plant was absent from his well tended garden. A visit to the garden revealed the gas plant dictamnus albus, and occlusive patch testing with leaf cuttings produced a reaction after the skin was exposed to sunlight. Gas plant phytophotodermatitis was diagnosed.
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ranking = 0.14285714285714
keywords = leaf
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3/4. gold sensitivity blast transformation.

    A 36-year-old female patient developed eczema from wearing gold jewelry. Epicutaneous skin tests were performed with gold leaf, potassium dicyanoaurate, gold sodium thiosulphate, gold chloride, sodium chloroaurate and potassium bromoaurate. The test was positive with gold sodium thiosulphate only. Blast transformation was induced with all the gold salts except sodium chloroaurate, and the positive responses seemed to be dose-dependent. in vitro gold salt-induced reactions are useful in the diagnosis of allergic contact dermatitis.
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ranking = 0.14285714285714
keywords = leaf
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4/4. The major allergen of Dendropanax trifidus Makino.

    Dendropanax trifidus Makino (family araliaceae, syn. Gilibertia trifida Makino) has been reported as causing allergic contact dermatitis in japan. To identify the major allergen, fractionated extracts of fresh leaves of Dendropanax trifidus were patch tested on 2 patients with hypersensitivity to the plant. Cis-9,17-octadecadiene-12,14-diyne-1, 16-diol (I), an analog of falcarinol, was identified as an active component. 18 normal control subjects were patch tested with the leaf of Dendropanax trifidus and I diluted to 0.05% in pet. 4 of them showed active sensitization to the leaf of Dendropanax trifidus and I. Our results suggest that I is the major allergen of Dendropanax trifidus and is a strong sensitizer. The results of patch testing on patients and control subjects with the leaves of Fatsia japonica Decne. et Planch. and hedera helix L., which also belong to the araliaceae family, and urushiol are also shown.
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ranking = 0.28571428571429
keywords = leaf
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