ACVR1 and fibrodysplasia ossificans progressiva: Similar to our patient, Towler et al described a child with CBHV (without any other limb abnormality) with a large intragenic deletion in BMP receptor 1B gene (BMPR1B) highlighting that CBHV is not exclusive to the diagnosis of FOP (ACVR1 mutation) and that the receptor-ligand BMP pathways affect toe development [22].