Table 4.
Pathology of false negative and false positive lesions
| Malignant | FDG-PET Non-Avid False Negatives (%) * |
|---|---|
| Adenocarcinoma | 62 (62) |
| Squamous Cell | 11 (11) |
| Carcinoma in situ | 11 (11) |
| Carcinoid/Neuroendocrine | 9 (9) |
| Other NSCLC | 4 (4) |
| Other Cancer | 1 (1) |
| Small Cell | 1 (1) |
| Unknown | 2 (2) |
|
| |
| Benign | FDG-PET Avid False Positives (%) |
|
| |
| Granuloma** | 55 (69) |
| Benign Tumor | 8 (10) |
| Active Infectious disease*** | 9 (11) |
| Fibrosis | 4 (5) |
| Other | 4 (5) |
*
11 of the false negatives were <1cm
**
Granuloma includes histoplasmosis, atypical mycobacteria, blastomycosis, cryptococcus, coccidiodomycosis, aspergillosis and nonspecific granulomas.
***
Infectious disease includes active Mycobacterium tuberculosis and active pneumonia