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. 2017 Mar 11;3:6. doi: 10.1186/s40748-017-0045-1

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 6 — Lung to head ratio (LHR) measurement – Obstetric ultrasound technique is used to measure the lung to head ratio known as LHR to assess the severity of CDH. The head circumference is measured as shown. The contralateral lung area is calculated as a product of the longest and perpendicular diameter of the contralateral lung. The ratio of this area to the head circumference gives the LHR. A LHR of <0.6 has been associated with poor outcome while a ratio of >1.35 has been associated with survival. Alternatively, an observed to expected LHR measurement is used in order to overcome bias secondary to gestational age. (Copyright Satyan Lakshminrusimha)