Mevalonate kinase deficiency (MKD) is a rare autoinflammatory autosomal recessive periodic fever disorder.1,2 Hyperimmunoglobulinemia D and periodic fever syndrome (HIDS) and mevalonic aciduria (MA) are both part of the MKD spectrum.3,4 They result from mutations in the gene encoding mevalonate kinase (MK). This evidence concerns the gene MVK and mevalonate kinase deficiency.