Newborn with prenatal diagnosis of neck mass who was delivered via an EX utero Intrapartum Treatment (EXIT) procedure

MRI of lymphatic malformation
Transverse (above) and sagittal (below) US of the neck and coronal (above) and axial T2 MRI without contrast of the neck shows an infiltrating multicystic mass of the neck surrounding the trachea that has minimal vascularity.

The diagnosis was lymphatic malformation.