title: Reverse discordant scintigraphy in diffuse goiter.
abstract: 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.
authors.affiliation: Department of Nuclear Medicine, University Hospital Utrecht, The Netherlands.
authors.forename: A W
authors.initials: AW
authors.lastname: Huiskes
authors.forename: J M
authors.initials: JM
authors.lastname: De Klerk
authors.forename: P M
authors.initials: PM
authors.lastname: Zelissen
authors.forename: P P
authors.initials: PP
authors.lastname: Van Rijk
authors.forename: J W
authors.initials: JW
authors.lastname: Van Isselt
mesh_terms: D006042:Goiter / Q000000981:diagnostic imaging*; D006801:Humans; D007457:Iodine Radioisotopes; D008297:Male; D008875:Middle Aged; D011877:Radionuclide Imaging; D019275:Radiopharmaceuticals; D013670:Sodium Pertechnetate Tc 99m
chemical_list: D007457:Iodine Radioisotopes; D019275:Radiopharmaceuticals; D013670:Sodium Pertechnetate Tc 99m