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We evaluated 87 subjects (37 males and 50 females, mean age 70 (\u00b16) years old) with AD. All of them were subjected to TSH, fT3 and fT4 assay and to cerebrospinal fluid amyloid (A\u03b21-42) and tau [phosphorylated-tau (p-tau) and total-tau (t-tau)] assay prior PET\/CT examination. Values for TSH, fT3 and fT4 were in the normal range. The relationships were evaluated by means of statistical parametric mapping (SPM8) using age, sex, MMSE, scholarship and CSF values of amyloid and tau as covariates. We found a significant positive correlation between TSH values and cortical glucose consumption in a wide portion of the anterior cingulate cortex bilaterally (BA32) and left frontal lobe (BA25) (p FWE-corr &lt;0.001; p FDRcorr &lt;0.000; cluster extent 66950). No significant relationships were found between cortical F-18 FDG uptake and T3 and T4 serum levels. The results of our study suggest that a cortical dysfunction in anterior cingulate and frontal lobes may affect serum values of TSH in AD patients.<\/jats:p>","DOI":"10.1038\/s41598-017-06138-7","type":"journal-article","created":{"date-parts":[[2017,7,18]],"date-time":"2017-07-18T08:54:48Z","timestamp":1500368088000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Functional correlates of TSH, fT3 and fT4 in Alzheimer disease: a F-18 FDG PET\/CT study"],"prefix":"10.1038","volume":"7","author":[{"given":"Agostino","family":"Chiaravalloti","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francesco","family":"Ursini","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alessandro","family":"Fiorentini","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gaetano","family":"Barbagallo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alessandro","family":"Martorana","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giacomo","family":"Koch","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mario","family":"Tavolozza","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Orazio","family":"Schillaci","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2017,7,24]]},"reference":[{"key":"6138_CR1","doi-asserted-by":"publisher","first-page":"1375","DOI":"10.1172\/JCI0216783","volume":"110","author":"DJ Selkoe","year":"2002","unstructured":"Selkoe, D. 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