Se estima que el 4% de la población mayor de 40 años tiene signos físicos compatibles con Nt, mientras que el 40% de la población en el mismo grupo etario tiene alguna anormalidad ultrasonográfica consistente con la definición de Nt.

Those affected by differentiated thyroid cancer tend to have a favorable clinical course, but some may show an aggressive course with relapses. The optimal treatment is still controversial, especially regarding the extent of surgery, indications for radioiodine and suppression of thyroid-stimulating hormone. Correct risk assessment facilitates a selective approach to therapy. We present a review of the role of nuclear medicine in the evaluation, treatment and follow-up of patients affected by this interesting disease. (creativecommons. org/licenses/by-nc-nd/4.0/).

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Objective: Evaluate impact after 223 Ra therapy and 18 F-NaF (sodium fluoride) PET/CT in the selection and evaluation of response in patients treated with 223 Ra in six different solid tumors. Material and Methods: Twenty patients with metastatic castration-resistant prostate cancer (mCRPC), seven metastatic castration-sensitive prostate cancer (mCSPC), three osteosarcoma, two breast cancer, two non-small cell lung cancer (NSCLC), one chondrosarcoma, one chordoma and one patient lung neuroendocrine carcinoma. Three groups of study were defined according total skeletal tumor-burden obtained by 18 F-NaF PET/CT, group 1 <1000cm 3 , group 2 1001–2999cm 3 and group 3 >3000cm 3 VOI´s. A semi-quantitative comparison was performed measuring the SUVmax values of VOIs values in all bone metastases in each patient previous to receive the first cycle of 223 Ra, after 3 and 6 cycles. Results: 30 patients non-progress disease was documented after 24±4 weeks. 8 patients progress disease was presented after three cycles of 223 Ra, two patients with osteosarcoma, four patients with mCRPC, one patient with chondrosarcoma and one patient with NSCLC. Group 1 patients showed better response rates compared to group 3 (p<0.05). Group 2 patients who showed improvement clinical and radiological, had prostate malignancies compared to those in the same group, but non-prostatic malignancies (p<0.05). No significant difference in group 2 patients compared to group 3 (p<0.67). Symptomatic skeletal-related event was observed in 7 patients. Conclusion: 18 F-NaF PET/CT allows to identify patients who show osteoblastic bone activity and discard or confirm progression in the interval PET/CT image, allowing change of treatment, reducing costs. High tumor-burden strongly suggests a poor response to treatment