Table 1.
Location of primary lesion in patients with incidentally found thyroid lesions on 18F-FDG PET/CT.
| Primary lesion | Primary diagnosis (n = 3,379) |
FDG uptake on PET/CT (n = 285) |
Malignancy (n = 23) |
| Breast | 893 | 97 | 7 |
| Gastrointestinal | 311 | 25 | 4 |
| Gynecologic | 297 | 31 | 3 |
| Lung | 306 | 21 | 2 |
| Lymphoma | 163 | 19 | 1 |
| Hepatobiliary | 159 | 8 | 1 |
| Head and Neck | 428 | 17 | 0 |
| Others | 132 | 6 | 0 |
| Unknown malignancy | 24 | 3 | 0 |
| Cancer screening | 666 | 58 | 5 |
FDG; fluorodeoxyglucose (FDG)
PET/CT; Positron emission tomography (PET)/Computed tomography (CT)