Detection of distant metastases and distant second primary cancers in head and neck squamous cell carcinoma: comparison of [18F]FDG PET/MRI and [18F]FDG PET/CT

Insights into Imaging

Table 1 Size and location of distant malignant lesions (73 metastases and 9 s primary cancers)

	Lesion size in mm (mean diameters ± SD)
	n	Maximum axial diameter	Minimum axial diameter	Cranio-caudal diameter
Distant malignant lesions	82	17.2 ± 8.5	13.1 ± 6.2	17.3 ± 9.6
Localization
Lung	24	15.9 ± 12.1	10.7 ± 5.9	14.7 ± 9.8
Mediastinum and hila	17	17.9 ± 4.0	12.5 ± 5.3	20.4 ± 9.5
Bone (spine, ribs, pelvis)	36	17.2 ± 6.8	14.1 ± 6.1	17.6 ± 9.8
Liver	5	23.0 ± 8.4	20.5 ± 7.0	17.2 ± 2.2

Second primary cancers were located in the lung/hila (n = 8) and in the liver (n = 1)