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Objective: We present four patients with thyroid carcinoma who underwent 11C-choline PET/CT for the detection of their primary rumor and its mctastases.Previous 18F-FDG PET had shown no abnormal tracer uptake in the lesions in three patients and only mild uptake in one patient.Methods: Four patients between the ages of 24 and 59 years (2 newly diagnosed and two with recurrence) underwent whole body 18F-FDG PET/CT.The patients then underwent regional 11C-choline PET/CT imaging on a separate day.Results: All of the lesions in four patients were 11C-choline avid except for a few small lung metastases.The SUVmax of the lesions was 7.94 ± 4.93.11C-choline imaging detected 3 primary tumors in 4 patients, one tumor in the tracheal wall in one patient, 7 cervical lymph nodes metastases in 3 patients and several lung metastases in one patient.Conclusions: 11C choline PET/CT may be a promising supplement to 18F-FDG PET/CT in the detection of thyroid carcinoma and its metastases.