LAUSR

216 Cervical lymphatic malformations: Prenatal imaging characteristics and neonatal outcomes of exutero intrapartum treatment Kelsey A. Stewart, Hadi Erfani, Sohum C. Shah, Ava Y. Jang, Elizabeth S. Kravitz, Ahmed A. Nassr, Jimmy Espinoza, Timothy C. Lee, Olutoyin A. Olutoye, Magdalena Sanz Cortes, Oluyinka O. Olutoye, Michael A. Belfort, Alireza A. Shamshirsaz Baylor College of Medicine, Houston, TX OBJECTIVE: The Ex-Utero Intrapartum Treatment (EXIT) procedure has been utilized to transition fetuses with prenatally diagnosed airway obstruction to postnatal life safely. We describe here the unique clinical course, diagnosis, treatment and neonatal outcomes of a series of patients with cervical lymphatic malformation managed with EXIT. STUDY DESIGN: Retrospective chart review of fetuses with prenatally diagnosed cervical lymphatic malformation delivered by EXIT from January 2001 to April 2018 in a tertiary referral fetal center. The size of lymphatic malformations is reported as a lesion volume ratio (LVR 1⁄4 length height width of the lesion 0.52 divided by the head circumference: all measurements in centimeters). Adjusted mass growth was defined as the differences in size between the first and last LVR divided by the interval between the two measurements. Primary neonatal outcomes included survival and tracheostomy at discharge. Secondary outcomes included neonatal course after delivery, pulmonary hypoplasia. Subjects were followed up to the median age of 2 years. Data are reported using descriptive statistics as median [range] and rate (%).