CALCA and medullary thyroid gland carcinoma: A very recent study compared 18F-FDG, 18F-DOPA and 68Ga-somatostatin analogues PET/CT imaging in patients with residual/recurrent MTC suspected on the basis of elevated serum calcitonin levels and showed that 18F-DOPA PET/CT was the most useful imaging method for detecting recurrent MTC lesions performing better than 18F-FDG and 68Ga-somatostatin analogue PET/CT (59).