1. From the Departments of Radiology (L.K.H., M.B.C., B.K.P., K.Y., S.E.E., R.E.S.), Pathology (E.D.), and Surgery (B.A.P.), Mayo Clinic, 5777 E Mayo Blvd, Phoenix, AZ 85054; Department of Radiology, Mayo Clinic, Rochester, Minn (A.A.B.); and Department of Radiology, Phoenix Children’s Hospital, Phoenix, Ariz (C.L.S.).