Clinical Nuclear Medicine

Skip Navigation LinksHome > December 2011 - Volume 36 - Issue 12 > Negative Amyloid PET Imaging in a Patient With Probable Alzh...
Clinical Nuclear Medicine:
doi: 10.1097/RLU.0b013e3182335e08
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Negative Amyloid PET Imaging in a Patient With Probable Alzheimer's Disease

Hellwig, Sabine MD*; Hüll, Michael MD; Meyer, Philipp T. MD, PhD

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Abstract

Amyloid positron emission tomography (PET) has emerged as an in vivo technique for visualizing the accumulation of fibrillar amyloid-beta (Aβ). Carbon-11 Pittsburgh compound-B (C-11 PIB) has gained widespread acceptance as a standard amyloid PET probe. We report a case of a 53-year-old woman with probable Alzheimer's disease (AD) confirmed by neuropsychological assessment and cerebrospinal fluid analyses. Fluorine-18 fluorodeoxyglucose PET depicted an AD-typical pattern of cortical hypometabolism. Unexpectedly, C-11 PIB PET detected no cortical Aβ depositions. The present case challenges the notion that a negative C-11 PIB scan excludes AD and argues for a comprehensive diagnostic workup.

© 2011 Lippincott Williams & Wilkins, Inc.

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