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I-131 whole-body imaging is used for detection of functioning metastases in patients with well differentiated thyroid carcinoma. False positive uptake of I-131 in nonthyroid related tumors have rarely been described in the literature. The authors present a patient with papillary thyroid cancer that demonstrates uptake of I-131 at scintigraphy due to malignant fibrous histiocytoma.
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Acar et al. (2007) studied this question.
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