PubMed · 7855537
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J L Wemeau. 1994-12-01. [Diffuse goiter and thyroid nodule. Diagnostic orientation].. https://pubmed.ncbi.nlm.nih.gov/7855537/
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Thyroid imaging has historically relied heavily on scintigraphy, although, not surprisingly in view of the superficial position of the gland, ultrasound has assumed an increasingly prominent role in recent years. The other cross-sectional imaging modalities can also be useful, and the emergence of new radiopharmaceuticals and the increasingly central role of fine needle aspiration cytology have further added to the range of diagnostic techniques available. This review attempts to summarize the current state of knowledge, and makes some suggestions for the most efficient use of imaging resources in the investigation of thyroid disease.
Both Tc-99m pertechnetate and radioactive iodine (I-123 NaI or I-131 NaI) are useful in thyroid scintigraphy. These radiopharmaceuticals yield similar functional information in most patients. Occasionally, however, discordant results have been reported in the literature (warm or hot on the pertechnetate image and cold on the radioiodide image). Most of these reports have concerned the solitary thyroid nodule. A case is presented here with diffusely decreased Tc-99m pertechnetate uptake and normal I-131 NaI uptake in a patient with a diffuse goiter and subclinical hyperthyroidism, so-called reverse discordant behavior.
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