FLNB and spondylocarpotarsal synostosis syndrome: Five disorders have been described from pathogenic variants in the FLNB gene: spondylocarpotarsal syndrome (SCT), Larsen syndrome, type I atelosteogenesis (AO1), type III atelosteogenesis (AO3), and boomerang dysplasia (Robertson, 2008; Farrington‐Rock et al., 2006).