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FDG-PET Scanning Shows Distributed Changes in Cortical Activity Associated with Visual Hallucinations in Eye Disease

[ Vol. 19 , Issue. 1 ]


Lütfü Hanoglu, Sultan Yildiz, Tansel Cakir, Taha Hanoglu and Burak Yulug*   Pages 84 - 89 ( 6 )


Background and Objective: Charles Bonnet Syndrome (CBS) has been defined as complex visual hallucinations (CVH) due to visual loss. The underlying mechanism of CBS is not clear and the underlying pathophysiology of the visual hallucinations in CBS patients and pure visually impaired patients is still not clear.

Methods: In our study, we have scanned three patients with eye disease and CBS (VH+) and three patients with eye disease without CBS (VH-) using FDG-PET.

Results: Our results showed underactivity in the pons and overactivity in primary right left visual cortex and inferior parietal cortex in VH- patients and underactivity in left Broca, left inf frontal primary visual cortex and anterior and posterior cingulate cortex in VH+ patients relative to the normative 18FFDG PET data that was taken from the database consisting of 50 age-matched healthy adults without neuropsychiatric disorders.

Conclusion: From this distributed pattern of activity changes, we conclude that the generation of visual hallucination in CBS is associated with bottom-up and top-down mechanism rather than the generally accepted visual deafferentation-related hyperexcitability theory.


Visual hallucination, charles bonnet syndrome, 18F-FDG PET scanning, visual deafferentation theory, glaucoma, age-related macular degeneration, diabetic retinopathy.


Regeneration and Restoration Center, Istanbul Medipol University, Istanbul, Regeneration and Restoration Center, Istanbul Medipol University, Istanbul, Department of Nuclear Medicine, Istanbul-Medipol University, Istanbul, Department of Neurosurgery, Ataturk University, Erzurum, Regeneration and Restoration Center, Istanbul Medipol University, Istanbul

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