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Case Report

Coexistence of atopic dermatitis and thrombocytosis: diagnostic odyssey: a case report

Fuad Al Mutairi, Meshal Alberreet, Lara Alkuhaimi, Khalid Aleisa, Rana Almana, Asma Awadalla.


Background: Atopic dermatitis (AD) is one of the most common diseases encountered in pediatric practice. Genetic factors play a role in the development of this condition. Topical corticosteroids are the cornerstone of AD management, but with potentially serious adverse events. Misuse of these medications is not uncommon.
Case Presentation: We describe a case of severe AD with inadvertent overuse of topical steroids. The patient presented with multisystem involvement and a cushingoid appearance. Laboratory tests showed thrombocytosis and abnormal liver function test, among other findings. A whole exome test showed mutations in two genes, a homozygous pathogenic variant c.317C>T p.(Pro106Leu) in the protooncogene, thrombopoietin receptor (MPL) gene (NM_005373.2) inherited from both parents and a de novo heterozygous c.139C>T p.(Arg- 47Cys) in the CARD11 gene (NM_001324281.1), that explain her combined presentation.
Conclusion: The aim of this report is to share our experience with the diagnosis and treatment of a challenging case. This report also shows the association between the MPL, CARD11 genes, and severe AD. In addition, this case is consistent with the published literature on systemic involvement in severe AD and variable response to routine management.

Key words: Atopic dermatitis, MPL, thrombocytosis, CARD11, whole exome sequencing.

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