False-Negative, False-Positive, and Additional FLT PET Findings
| Location | No. of lesions | PA | Result | Diagnostics |
|---|---|---|---|---|
| Deep groin | 1 | Pos | FN | Aspiration cytology |
| Dermal or subcutaneous metastases on back | 9 | Pos | FN | Histopathology |
| Back (primary tumor) | 1 | Pos | FN | Histopathology |
| Deep groin | 1 | Neg | FP | Histopathology |
| Leg (heel) | 1 | Neg | FP | Reresection in 1998 negative and clinically negative, follow-up of 5 y |
| Mediastinal | 3 | NP | FN | CT |
| Thoracic vertebra | 1 | NP | FN | CT |
| Lumbar vertebra | 1 | NP | NA | Bone scan with multiple bone metastases (also spinal) 2.5 mo after PET |
| Fossa poplitea | 1 | NP | NA | Clinically negative, follow-up of 4 mo |
| Mediastinal | 1 | NP | TN | CT |
| Paraaortal | 1 | NP | TN | CT |
| Head and neck | 2 | NP | TN | Clinically negative, follow-up of 3 mo |
| Mediastinal | 2 | NP | TP | CT |
| Paraaortal | 2 | NP | TP | CT |
| Supraclavicular | 1 | NP | TP | Physical examination |
PA = pathologic examination.
Pos = positive; FN = false-negative; Neg = negative; FP = false-positive; NP = not performed; NA = not assessable; TN = true-negative; TP = true-positive.