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

Figure 18 Recurrent primary tumor detected by positron emission tomography/computed tomography. A T3N0M0 right palatine tonsil squamous cell carcinoma was demonstrated on axial T2W magnetic resonance imaging (MRI) (blue arrow) (A) and coronal contrast-enhanced T1W MRI (B). MRI and positron emission tomography/computed tomography (PET/CT) performed 2 and 3 mo after completion of chemoradiation demonstrated complete treatment response (not shown). Surveilance PET/CT (C and D) revealed intense increase metabolism in the right palatine tonsil and medial pterygoid muscle (red arrows) representing a recurrent squamous cell carcinoma.