tokens: Nonenhanced CT demonstrated > 20 Hounsfield Units ( HU ) for all tumours ( median 34 ( 21 - 45 ) ) , median size 92 mm ( 20 - 196 ) , Ki67 17 % ( 1 - 40 % ) , Weiss score 7 ( 4 - 9 ) and Helsinki score 24 ( 4 - 48 ) .