1 Department of Radiology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA (O.S., A.V.). Electronic address: simseko@chop.edu.
2 Radiology Research Scholar, Division of Neuroradiology, Department of Radiology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA (A.M., A.V.).
3 Department of Radiology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA (O.S., A.V.); Radiology Research Scholar, Division of Neuroradiology, Department of Radiology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA (A.M., A.V.); Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA (A.V.).