Table 2.

Lesion-based sensitivity of whole-body PET, Gd-MRI, regional PET and regional PET/Gd-MRI

	WB PET	Gd-MRI	R PET	R-PET/Gd-MRI
Primary site in head and neck a
Primary site (n = 10)
Concordance	10	9	10	10
Discordance	0	1	0	0
Sensitivity	100 %	90 %	100 %	100 %
Suspicious lymph node metastases b
Suspicious lymph node metastases (n = 40)
Concordance	16	16	16	16
Discordance	6	0	23	24
Sensitivity	55 %	40 %	98 %	100 %

^a All primary lesions were confirmed by pathology (benign = 2, malignant lesions = 8)

^b Total suspicious metastatic lymph nodes were 40. Five of 40 were confirmed by pathology (n = 5) and the others (n = 35) were confirmed by multimodal imaging and clinical decision. Coincidence or discordance was based on pathology, multimodal imaging and clinical decision. All pathologic confirmed lesions (n = 5) showed concordance