“…[ 3 , 4 , 6 , 7 , 9 , 11 , 14 ] However, the high glucose utilization of the normal brain frequently complicates the identification of brain tumors. [ 3 , 6 , 8 , 11 , 15 ] On the other hand, due to the low uptake of amino acids in the brain, the contrast between tumors and normal brain is generally better visualized with amino acid scanning. [ 8 , 12 , 15 ] Although the degree of FDG uptake does not always reflect the grade or progression of primary brain tumors,[ 4 , 14 ] MET-PET is more efficient in delineating gliomas and in differentiating recurrence from radiation necrosis.…”