{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T08:52:34Z","timestamp":1789980754001,"version":"4.0.1"},"reference-count":12,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"2","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Clin Nucl Med"],"published-print":{"date-parts":[[2018,2]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>PET using FDG is a critical tool for evaluation of dementias, with characteristic patterns of hypometabolism suggesting specific diagnoses. Hypometabolism in the occipital region is recognized as an important finding associated with dementia with Lewy bodies and posterior cortical atrophy. We describe here the novel \u201coccipital tunnel\u201d sign, which results from relative sparing of FDG uptake in the medial occipital (primary visual) cortex compared with more severe loss in the surrounding lateral occipital (visual association) cortex. This sign is useful for recognizing the occipital findings of dementia with Lewy bodies and posterior cortical atrophy, especially when viewing sagittal projections.<\/jats:p>","DOI":"10.1097\/rlu.0000000000001925","type":"journal-article","created":{"date-parts":[[2017,12,12]],"date-time":"2017-12-12T16:14:43Z","timestamp":1513095283000},"page":"e59-e61","source":"Crossref","is-referenced-by-count":14,"title":["\u201cOccipital Tunnel\u201d Sign on FDG PET for Differentiating Dementias"],"prefix":"10.1097","volume":"43","author":[{"given":"David M.","family":"Sawyer","sequence":"first","affiliation":[{"name":"From the *Tucson Hospitals Medical Education Program; and \u2020Departments of Medical Imaging, Biomedical Engineering, and Medicine, University of Arizona College of Medicine, Tucson, AZ."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Phillip H.","family":"Kuo","sequence":"additional","affiliation":[{"name":"From the *Tucson Hospitals Medical Education Program; and \u2020Departments of Medical Imaging, Biomedical Engineering, and Medicine, University of Arizona College of Medicine, Tucson, AZ."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"276","reference":[{"key":"bib1-20230925","doi-asserted-by":"crossref","first-page":"1638","DOI":"10.2967\/jnumed.109.065870","article-title":"The 18F-FDG PET cingulate island sign and comparison to 123I-beta-CIT SPECT for diagnosis of dementia with Lewy bodies","volume":"50","year":"2009","journal-title":"J Nucl Med"},{"key":"bib2-20230925","doi-asserted-by":"crossref","first-page":"358","DOI":"10.1002\/ana.1133","article-title":"Alzheimer's disease versus dementia with Lewy bodies: cerebral metabolic distinction with autopsy confirmation","volume":"50","year":"2001","journal-title":"Ann Neurol"},{"key":"bib3-20230925","doi-asserted-by":"crossref","first-page":"531","DOI":"10.1159\/000132084","article-title":"Cerebral metabolic dysfunction in patients with dementia with Lewy bodies and visual hallucinations","volume":"25","year":"2008","journal-title":"Dement Geriatr Cogn Disord"},{"key":"bib4-20230925","doi-asserted-by":"crossref","first-page":"1138","DOI":"10.1002\/gps.2836","article-title":"Glucose hypometabolism in primary visual cortex is commonly associated with clinical features of dementia with Lewy bodies regardless of cognitive conditions","volume":"27","year":"2012","journal-title":"Int J Geriatr Psychiatry"},{"key":"bib5-20230925","doi-asserted-by":"crossref","first-page":"684","DOI":"10.1148\/rg.343135065","article-title":"Brain PET in suspected dementia: patterns of altered FDG metabolism","volume":"34","year":"2014","journal-title":"Radiographics"},{"key":"bib6-20230925","doi-asserted-by":"crossref","first-page":"281","DOI":"10.1111\/jon.12104","article-title":"Syndrome-specific patterns of regional cerebral glucose metabolism in posterior cortical atrophy in comparison to dementia with Lewy bodies and Alzheimer's disease\u2014a [F-18]-FDG pet study","volume":"25","year":"2015","journal-title":"J Neuroimaging"},{"key":"bib7-20230925","doi-asserted-by":"crossref","first-page":"636","DOI":"10.1007\/s11682-015-9434-0","article-title":"The relationship between hallucinations and FDG-PET in dementia with Lewy bodies","volume":"10","year":"2016","journal-title":"Brain Imaging Behav"},{"key":"bib8-20230925","doi-asserted-by":"crossref","first-page":"716","DOI":"10.1126\/science.1948051","article-title":"Functional mapping of the human visual cortex by magnetic resonance imaging","volume":"254","year":"1991","journal-title":"Science"},{"key":"bib9-20230925","doi-asserted-by":"crossref","first-page":"1483","DOI":"10.1007\/s00415-015-7732-5","article-title":"Clinical, FDG and amyloid PET imaging in posterior cortical atrophy","volume":"262","year":"2015","journal-title":"J Neurol"},{"key":"bib10-20230925","doi-asserted-by":"crossref","first-page":"27","DOI":"10.1007\/s00415-005-0594-5","article-title":"Posterior cortical atrophy: variant of Alzheimer's disease? 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