Visualization of the position of the fetal heart, the right lung and the spine in the case of fetus at 27 gestational weeks diagnosed with left lung agenesis. At the transverse plane of thorax level, the right lung was not detected and the fetal heart moved toward the left and posterior. The cardiac axis was about 120°toward left side. LV, left ventricle; RV, right ventricle; Sp, spine.