Fig. 2From: Clinical application of combination [11C]C-methionine and [13N]N-ammonia PET/CT in recurrent functional pituitary adenomas with negative MRI or [18F]F-FDG PET/CTOverlap of increased [11C]C-MET uptake in tumors and pituitary tissue. [11C]C-MET PET/CT images showed that both tumors and pituitary tissue had a high [11C]C-MET uptake, while only pituitary tissue had a high [13N]N-NH3 uptake. Neither tumors nor pituitary tissue was detected by [18F]F-FDG PETBack to article page