FIGURE 2.  ¹⁸F-FDG PET (A), CT (B), and ¹⁸F-FET PET (C) images of 52-y-old man with 0.7-cm SCC in 4.3-cm ulcer with inflammatory tissue (arrows). ¹⁸F-FDG PET scan shows approximately 4-cm lesion with increased ¹⁸F-FDG uptake (SUV, 5.2) that allows no discrimination between carcinoma and inflammation. CT scan demonstrates air-filled ulcer, and ¹⁸F-FET PET scan reveals no abnormal ¹⁸F-FET uptake (SUV, 1.5), missing the small carcinoma.