Figure 2
F-18 FDG PET and CT scan findings. (A) Ill defined heterogeneous enhancing soft tissue mass lesion in the right tongue base and enlarged lymph nodes in the right level II are observed on a plain contrast CT scan. (B) F-18 FDG PET reveals a hypermetabolic lesion (arrow) in the right tongue base and lymph node in the right level II. (C) A follow-up CT scan reveals no evidence of mass lesion in the right tongue and no significant lymph node in both necks after the treatment. (D) After the treatment, a 1 month follow-up PET scan shows disappearance of the previous hypermetabolic lesion.