Background: Visceral leishmaniasis (VL) triggered genetic hemophagocytic lymphohistiocytosis (HLH) is clinically challenging.
Observations: One-year-old VL-HLH patient improved after liposomal-amphotericin-B therapy, but subsequently deteriorated, although bone marrow amastigotes disappeared. Symptoms resolved after 8 weeks of HLH-2004 therapy but recurred upon cessation. Homozygous UNC13D gene 627delT mutation was identified however stem cell donor was unavailable. The patient died at age 4 years after central nervous system attacks and HLH recurrences.
Conclusions: VL in HLH patients does not exclude a genetic etiology and requires structured clinical management. VL should be excluded in all HLH patients in endemic regions before immunochemotherapy, which is recommended for VL-HLH patients unresponsive to VL treatment and/or reactivated.
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