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Downloaded from http://journals.lww.com/ultrasound-quarterly by BhDMf5ePHKbH4TTImqenVA5KvPVPZ0P5BEgU+IUTEfzO/GUWifn2IfwcEVVH9SSn on 06/10/2020 CME ARTICLE Ruth B. Goldstein, MD*Þ lung abnormalities known as bronchopulmonary foregut mal- Key Words: thorax, fetus, cystic adenomatoid, sequestration formations that include bronchogenic cysts and bronchopul- diaphragmatic hernia, chest mass monary sequestrations. Bronchi and primitive airspaces are (Ultrasound Quarterly 2006;22:177Y194) formed through sequential budding. Formation of the bronchi is complete by 16 weeks. No further bronchi will form after 16 weeks. Between 16 and 24 weeks, there is an increase in size and number of primitive airspaces. After 24 weeks, alveoli LEARNING OBJECTIVES and terminal air sacs continue to develop. It is speculated that 1. Detect and recall the natural history of fetal lung mass. insults at various stages of lung development result in charac- 2. Distinguish a lung mass from a congenital diaphragmatic teristic abnormalities. hernia and to understand the difference in their prognoses. In addition to normal embryological development, the 3. Distinguish which fetal chest masses can be managed following are also required for normal lung maturity: ade- expectantly and which might require treatment before birth. quate thoracic space, innervation of the diaphragm, and adequate intrapulmonary fluid. Intrapulmonary fluid is pro- duced by the developing lung and functions as
Ultrasound quarterly – Wolters Kluwer Health
Published: Sep 1, 2006
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