RASA1 LOF variants are associated with CM-AVM as a complex vascular anomaly that often concurrently presents with LAs.1,41,42 No features of CM-AVM were documented in this case though IUFD occurred and CM-AVM are rarely diagnosed prenatally.43 If CM-AVM was absent, this case may represent an expansion of the RASA1 genotype–phenotype association, which is supported by a RASA1 deletion variant recently identified in a case of fetal hydrops without CM-AVM.44 Here, RASA1 is linked to hydrops fetalis.