Table 3.

Studies evaluating performance of 18F-FDG PET or PET/CT for the detection of carcinoma of unknown primary in patients with negative workup.

Author year	Number of patients	All positive	True positive	False positive	Percent detected by PET
Padovani et al. [46], 2009	13	9	7	2	54%
Silva et al. [47], 2007	25	9	3	6	12%
Fakhry et al. [48], 2006	20	10	7	3	35%
Wong and Saunders [49], 2003	17	8	5	3	29%
Fogarty et al. [50], 2003	21	6	1	5	5%
Johansen et al. [51], 2002	42	20	10	10	24%
Kresnik et al. [52], 2001	15	12	11	1	73%
Jungehulsing et al. [53], 2000	27	7	7	0	26%
Total	180	81	51	30	28%