Morphological features of skin changes in the undetermined clinical picture of psoriasis and atopic dermatitis in children

Absrtact

Introduction The literature describes atypical clinical forms of psoriasis and atopic dermatitis in children that combine features of both diseases. In such cases, dermatologists resort to biopsy of plaque skin elements in the complex diagnosis. However, the histological picture in these biopsy specimens is uncertain and does not allow to make an unequivocal judgment about the correspondence of changes to one or another disease.

The purpose of work was to compare pathomorphological changes in biopsy specimens of plaque skin elements in children with undetermined clinical picture of the disease with changes in typical forms of psoriasis and atopic dermatitis.

Materials and methods A morphometric study of 10 plaque skin biopsy specimens from children (mean age 9.2±1.11 years) with an indeterminate clinical picture of the disease was performed. The obtained data were compared with two control groups of adult patients with typical clinical pictures of psoriasis (n=20; mean age 34.35±3.58 years) and atopic dermatitis (n=10; mean age 41.33±7.35 years).

Results A comparative morphometric analysis of skin biopsy specimens revealed the fewest differences between the analyzed parameters of the squamous epithelium of the patients in the study group and the group with psoriasis. In all three groups, the main mass of the inflammatory infiltrate in the dermis was composed of lymphocytes and macrophages whose numerical density differed in psoriasis and atopic dermatitis at different levels of the dermis, while in the study group it had intermediate values. The number of neutrophils and eosinophils in the study group had minimal values.

Discussion Morphological changes in the epidermis of the study group were closest to those in psoriasis, while the cellular composition of the inflammatory infiltrate of the dermis did not correspond to any of the control groups and had either intermediate values (in terms of lymphocytes and macrophages) or minimal values (in terms of eosinophils and neutrophils).

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