NA;Imaging with Ihyphen;131 MIBG has proved useful for the detection of pheochromocytoma, neuroblastoma, and other neoplasms of neural crest origin. The authors present a case of a patient who was initially diagnosed as having follicular carcinoma of the thyroid in which Ihyphen;131 MIBG played a key role in leading to the diagnosis of medullary carcinoma of the thyroid. Local and distant metastases were detected using Ihyphen;131 MIBG imaging. Uptake of Ihyphen;131 MIBG by medullary carcinoma of the thyroid has both diagnostic and therapeutic implications.
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