Volume 95 No. 5 May 2012 a newborn Male, delivered by Caesarean section after induction at 41 weeks of gestation for failure to progress, was admitted to the Women and Infants’ Hospital (WIH) Neonatal Intensive Care Unit (NICU) with a large vascular mass on his left knee (Figure 1). Routine prenatal US had been normal and the pregnancy had been uneventful. Physical examination at delivery was otherwise unremarkable. In addition to the WIH NICU team, the baby was followed clinically by pediatric surgical and interventional members of the Hasbro Children’s Hospital Vascular Anomalies Clinic (HVAC). On day two in the NICU, the patient developed signs of congestive heart failure. A chest radiograph demonstrated pulmonary edema and mild cardiomegaly (not shown). On day 14, the lesion began to bleed briskly.
