“…In retrospective studies, primary CMs were categorized either as hypertrophic or nonhypertrophic/dilated phenotypes, with some further differentiating a mixed phenotype, suggesting that a simplifying classification appears to be more accurate and reproducible [ 5 , 6 , 8 ]. However, increased sophistication in ultrasound technologies has proposed a more detailed classification encompassing RCM and isolated NCCM, taking varying prognostic parameters and adapted prenatal genetic testing into account [ 7 , 24 , 25 ]. Consequently, in the absence of standardized guidelines and multiple definitions in use, the distribution of fetal phenotypes remains unclear with a prevalence of HCM varying from 18.0% to 60.0% and of DCM from 11.0% to 72.0%, as the most common subgroups [ 5 , 6 , 8 ].…”