Fig. 5
A patient aged 50–55 years with brain abscess. The lesion displays obviously increased uptake of 11C-MET (d) and mild increased uptake of 18F-FDG (b) with lower uptake of 13N-NH3 (c) compared with contralateral normal brain parenchyma. Contrast CT (a) shows a ring enhanced lesion in the right temporal lobe (arrow)