Histopathology of Hand-Foot-Mouth Disease in Adults and Criteria for Differentiation From Erythema Multiforme

The American Journal of Dermatopathology
Almut Böer-Auer, Dieter Metze

Abstract

Hand-foot-mouth disease (HFMD) is a common contagious viral infection usually affecting infants and children. Recently, literature on HFMD in adults is increasing. It has been reported that adults often present with unusual exanthems with similarities to erythema multiforme (EM). No study has so far compared the histologic features of HFMD with those of EM. Histopathologic features in 7 biopsies of 6 adult patients with HFMD are compared with biopsies from 9 patients with EM to identify the best criteria for differentiation. HFMD and EM both have a perivascular lymphocytic infiltrate together with epidermal necrosis, spongiosis, ballooning, and reticular alteration. However, large numbers of neutrophils in parakeratosis (P < 0.05), in the viable epidermis (P < 001), or neutrophils forming intraepidermal collections (P < 0.05) are significantly more common in HFMD. In HFMD, necrotic keratinocytes are emphasized in the upper third of the epidermis (P < 0.05), whereas the lower third is typically involved more in EM. Neutrophils are significantly more common and more numerous in the dermal infiltrate of HFMD compared with EM (P < 0.01) Extravasated erythrocytes in the epidermis are more common and more numerous in HFMD (P < 0.05)....Continue Reading

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Citations

Apr 3, 2020·Der Pathologe·Almut Böer-Auer

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