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Background : Noncompaction of ventricular myocardium is a cardiomyopathy that typically involves the left ventricle or both ventricles; it has often been associated with mutations in genes encoding sarcomere proteins. Little is known about isolated right ventricular noncompaction, as only a few cases have been reported.  Case Report:  A 30 year old G2P1 woman experienced a spontaneous fetal loss at 19 weeks and 4 days. An ultrasound examination at 19 weeks showed right ventricular and tricuspid valve abnormalities, ascites, and early hydrops. At autopsy, the right ventricular chamber was dilated with numerous prominent trabeculations and deep intrabecular recesses as well as a dysplastic tricuspid valve. Histologic examination confirmed isolated right ventricular noncompaction. Whole exome sequencing showed a likely pathogenic variant in the  MYH7  gene.  Conclusions:  This appears to be the first report of isolated right ventricular noncompaction associated with a gene mutation as well as the first diagnosis in a fetus.

Prenatal Diagnosis of Isolated Right Ventricular Non-Compaction Cardiomyopathy with an MYH7 Likely Pathogenic Variant