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FIGURE 5.  Patient with T4 N3 M0 squamous cell carcinoma of right piriform sinus. CT, MRI (T2-weighted fat suppression), and ¹⁸F-FDG PET were performed before treatment (PRE-R) and during wk 3 (26 Gy) and wk 5 (46 Gy) of treatment with chemoradiotherapy. Three sets of images were coregistered by use of semiautomatic tool based on isocontouring. Substantial reduction in tumor volume and metabolic activity can be observed throughout treatment.

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