Rare homozygous GDF2 variants in children have been identified in PAH (Wang et al., 2016 and this study), possible PAH associated with HHT (Gallego et al., 2021), PAVM‐related disease (Hodgson et al., 2021; Liu et al., 2020) and non‐immune hydrops fetalis (NIHF) (Aukema et al., 2020). The gene discussed is GDF2; the disease is hereditary hemorrhagic telangiectasia.