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Lichen sclerosus et atrophicus. A histological, immunohistochemical and electron microscopic study

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Abstract

We studied three cases of genital lichen sclerosus et atrophicus (LSA) using histological, immunohistochemical and ultrastructural techniques to elucidate the characteristics of the collagen fibres, the elastic fibres and the interfilamentous matrix in the upper dermal homogeneous zone. In the early stages of LSA, the homogeneous zone caused elaunin fibres to push downwards and partially disappear, the collagen fibres were presumably phagocytosed by fibroblasts, and there were peculiar cells containing numerous vacuoles in the cytoplasm. In the advanced stages of LSA, the homogeneous zones showed newly formed collagen fibres and amorphous, dispersed, medium electron-dense substances that were probably composed of elastin or elastin-like substances and microfilaments originating from the collagen fibres. Immunohistochemically, there were numerous anti-aortic alpha-elastin-positive substances, but there was no positivity for anti-amyloid P component. These findings suggest that in advanced LSA a hybrid substance (elastocollagenous mass) between collagen fibres and elastic fibres may be formed in the homogeneous zone.

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Authors and Affiliations

  1. Department of Dermatology, Faculty of Medicine, Tottori University, 36-1, Nishimachi, 683, Yonago, Japan

    Y. Mihara, M. Mihara, Y. Hagari & S. Shimao

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  1. Y. Mihara
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  2. M. Mihara
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  3. Y. Hagari
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  4. S. Shimao
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Mihara, Y., Mihara, M., Hagari, Y. et al. Lichen sclerosus et atrophicus. A histological, immunohistochemical and electron microscopic study. Arch Dermatol Res 286, 434–442 (1994). https://doi.org/10.1007/BF00371568

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  • DOI: https://doi.org/10.1007/BF00371568

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