Fig. 15
From: FDG-PET/CT pitfalls in oncological head and neck imaging
a Axial PET/CT image shows no evidence of abnormal FDG uptake or metastatic cervical adenopathy in the neck. Physiological mild FDG uptake is seen in the thyroid gland, oesophagus and in the scalenus muscles (dashed arrows). This patient was a follow-up case of a SCC of the base of the tongue. b Corresponding CECT image (1 mm slice) detects a 5 x 7 mm sized enhancing node at left level IV (white arrow). This node did not show an increased FDG uptake on the PET acquisition of the PET/CT (slice thickness of PET acquisition was 5 mm). US FNAC revealed metastatic lymphadenopathy. Neck dissection confirmed metastasis from HNSCC. Dashed arrows in b point at normal anterior scalenus muscles