1. From the Department of Radiology, Mayo Clinic, 5881 E Mayo Blvd, PX CB 01 RADGLY, Phoenix, AZ 85054 (L.K.H.); Department of Radiology, Phoenix Children’s Hospital, Phoenix, Ariz (C.L.S.); and Departments of Radiology (G.A.W., A.A.B.) and Pathology (M.H.S.), Mayo Clinic, Rochester, Minn.