Role of 18F-FDG PET/CT in pre and post treatment evaluation in head and neck carcinoma

Figure 16 Complete response of a metastatic lymph node. A T2N2bM0 right palatine tonsil squamous cell carcinoma (red arrow) and right level IIa metastatic lymph node (yellow arrows) were seen on both contrast-enhanced computed tomography (CT) (A) and positron emission tomography/CT (PET/CT) (B). After chemoradiation, the node was smaller on contrast-enhanced CT at 6 wk (C) and hypometabolic on PET/CT at 4 mo (D), representing complete response to treatment. Negative physical examination and PET/CT at 1 year (E) confirmed true negative result of the PET/CT performed at 4 mo.