ComparePET and PET / CT results with follow-up results post PET / CT scan (n = 109) Recurrence / metastasis Modality Yes No p n% n% PET Positive 75 92.6 6 7.4 <0, 001 Negative 10 35.7 18 64.3 PET / CT Positive 79 92.9 6 7.1 <0, 001 Negative 6 25 18 75 Remarks: - PET results showed that 6/81patients (7.4%) were false positive and 10/28 patients (35.7%) were false negative.