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FDG-PET accuracy improved with lesion size from 67% in lesions that were 1–2cm (sensitivity 76% and specificity 35%) to 84% in lesions that were 3 to 5 cm (sensitivity 90% and specificity 18%) (p<0.001 using an analysis of variance test). Accuracy of FDG-PET to diagnose lung cancer by lesion size in millimeters. Accuracy = (True Positives + True Negatives)/Total Population
