Journal of Research in Medical Sciences1735-199516420110415Metastatic medullary thyroid carcinoma: A case report59445944ENMitraNiafarAssociate Professor, Endocrinology and Metabolism Section, Department of Medicine, Imam Reza Hospital, Tabriz University of Medical Sciences, Tabriz, Iran. dr_niafar@yahoo.comShahramDabiriFarshidBozorgiFaridNiafarNasrinGholami201008272010121520101104Medullary thyroid carcinoma accounts for 4% of thyroid carcinoma and originates from parafollicular cells, secreting calcitonin and carcinoembryonic antigen (CEA). Conventional radiographic modalities such as Computerized Tomography (CT), Magnetic Resonance Imaging (MRI), and Ultrasonography (U/S), are used for detecting recurrences following total thyroidectomy. However, metastatic disease frequently escapes detection by the above modalities, even when its presence is suggested by persistently elevated serum calcitonin levels. In this paper, we report a case of medullary thyroid carcinoma in a 40 year-old woman who had whole body octreotide scintigraphy to evaluate and detect the origin of calcitonin and CEA secretion.KEYWORDS:Thyroid cancer, Medullary, Calcitonin, Neoplasm metastasis