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

Figure 2 Positron emission tomography/computed tomography for delineation of oral cavity tumor extent. A T4a oral and base of tongue squamous cell carcinoma (red arrows) diffusely and symmetrically infiltrates the ventral aspect of the tongue, whose margins are difficult to appreciate on contrast enhanced computed tomography (CT) (A and B). On the other hand, positron emission tomography/CT (PET/CT) (C and D) clearly demarcates the tumor extent.