Temporal ultrasound findings in the first trimester of a dual fetal demise occurring in a monochorionic diamniotic twin gestation

Single fetal demise in monochorionic gestations in the 2nd and 3rd trimester is associated with adverse outcomes for the co-twin. We present a case of single demise in a monochorionic gestation in the 1st trimester with evidence of subsequent hemodynamic aberrations in the co-twin, supportive of feto-fetal hemorrhage occurring early in gestation. The authors report there are no competing interests to declare. All data generated and analyzed in this case report are included in this article.