PET-CT identified at least 1 additional FDG-avid lymph node in 95 of 135 patients ( 70.4 % ; 95 % confidence interval [ CI ] : 61.9 % -77.9 % ) and 1 additional lymph node area in 55 of 135 patients ( 40.7 % ; 95 % CI : 32.4 % -49.5 % ) .