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Prominent dermal Langerhans cells in an Omenn syndrome patient with a novel mutation in the IL2RG gene.
Journal of Dermatology 2019 August 28
Prominent dermal infiltration by Langerhans cells (LC) is a rare finding in patients with Omenn syndrome (OS). Here, we report the case study of a 7-month-old boy with OS and with prominent dermal infiltration by LC, which is a rare histological manifestation of the skin. Striking erythroderma appeared in the patient 2 weeks after birth. We also noted alopecia, lymphadenopathy, hepatosplenomegaly, eosinophilia and an elevated serum immunoglobulin E level with hypogammaglobulinemia. Peripheral blood flow cytometry showed the Tlow NK+ B+ immunophenotype and genetic analysis, a novel mutation in the IL2RG gene (c.337_339delTCT, p.Ser113del). The final diagnosis was that of OS. He responded well to an allograft umbilical cord blood transplantation that was performed when the patient was 8 months of age. We speculate that the LC accumulated in the dermis will eventually migrate to the regional lymph node, then stimulate autoreactive T cells by overpresenting antigens, thus causing OS-specific skin symptoms.
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