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T1 2cm or less with less than 2 high risk features T2 >2cm or any size with 2 or more high risk features T3 invasion of maxilla, mandible, orbit or temporal bone T4 invasion of skeletonor perineural invasion of skull bone High risk features >2mm thickness, Clark lev3l >3, pni, ear, non hair bearing lip or poorly diff N1 single ips node 3cm or less N2 multiple less than 6cm N3 >6cm RT indications + margins, PNI named nerve, >3cm primary, ext. skeletal muscle invasion, bone/cartilage invasion, SCC of the parotid <2cm 45Gy/15 >2cm no cartilage involvement 55Gy/22 >2cm 60Gy/30 electrons Dmax or 95% IDL