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Brain perfusion patterns in familial frontotemporal lobar degeneration
H Seelaar1, J M Papma, G Garraux
1Department of Neurology, Erasmus MC-University Medical Center Rotterdam, Rotterdam, the Netherlands.
Neurology
|July 15, 2011
Summary
Familial frontotemporal lobar degeneration (FTLD) subtypes show distinct clinical and perfusion patterns. MAPT mutations are linked to naming deficits and temporal hypoperfusion, while FTLD-TDP involves memory issues and posterior brain changes.
Area of Science:
- Neuroscience
- Genetics
- Radiology
Background:
- Frontotemporal lobar degeneration (FTLD) is a complex neurodegenerative disease with diverse clinical, genetic, and pathological presentations.
- Understanding genetic subtypes is crucial for accurate diagnosis and targeted therapies.
Purpose of the Study:
- To compare clinical manifestations and brain perfusion patterns in patients with familial FTLD caused by MAPT mutations versus TAR DNA-binding protein 43 kDa (TDP) mutations.
- To differentiate between familial FTLD-TDP and MAPT genetic subtypes using SPECT imaging.
Main Methods:
- SPECT imaging with (99m)Tc-HMPAO was performed on 29 familial FTLD patients (19 FTLD-TDP, 10 MAPT) and 10 controls.
- Voxel-based group analyses using SPM8 were conducted to identify significant differences in brain perfusion.
- Clinical data, including age at onset and specific deficits, were correlated with genetic subtypes and perfusion patterns.
Main Results:
- Familial FTLD-TDP patients presented with later onset and more memory deficits compared to MAPT patients.
- MAPT patients exhibited more naming deficits and obsessive-compulsive behavior.
- SPECT revealed reduced perfusion in the right frontal lobe, precuneus, and inferior parietal lobule in FTLD-TDP.
- MAPT patients showed decreased perfusion in the left temporal and inferior frontal gyri.
Conclusions:
- Familial FTLD-TDP is associated with posterior hypoperfusion (precuneus, inferior parietal lobule) and memory impairment.
- MAPT mutations correlate with temporal hypoperfusion and naming deficits.
- Distinct perfusion patterns on SPECT can help differentiate between these familial FTLD subtypes.
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