Neck ultrasound results before PET / CT scan Characteristics Number (n) Percentage (%) Results Positive 68 62.4 Negative 41 37.6 Lesions' site Thyroid bed 4 3.3 Cervical LN level I 0 0 Cervical LN level II 30 25 Cervical LN level III 22 18.3 Cervical LN level IV 49 40.8 Cervical LN level V 2 1.7 Cervical LN level VI 13 10.8 Sum 120 100 Remarks: - Positive neck ultrasound was in 62.4% of patients.