CDH (left) at 22 weeks 3 days

In left CDH, the LHR is calculated by measuring the two-dimensional area of the right lung (in square millimeters) at the level of the atria and dividing by the head circumference (in millimeters).
(A) Transverse image of fetus at 22+3 weeks with left CDH. Heart is displaced into right chest.
(B) Anteroposterior and lateral measurements of right lung measurements in preparation for LHR calculation.
(C) Tracing method of right lung measurement for LHR calculation.
(D) Sagittal view of same fetus showing liver, stomach, and bowel in left chest.