Perivascular Basal Echogenicity in the Fetal Heart: An Unconventional Marker of Maternal Autoimmune Antibodies

Fetal congenital heart block is a widely recognized complication of pregnancies with anti Ro/La antibodies. Less common presentations, including dilated cardiomyopathy, myocarditis, valvular insufficiency, and endocardial fibroelastosis, have also been described in these fetuses. We present two cases where recognition of isolated basal echogenicity of the fetal heart, an unconventional manifestation of anti-SSA antibodies during pregnancy, led to a suspicion and ultimately diagnosis of antibody positivity in the mother. These cases highlight the importance of being aware of this rare manifestation of anti-SSA antibodies during pregnancy, as early recognition of antibody positivity may lead to improve fetal and maternal outcomes.