Abstract
Introduction
Differential diagnosis between Parkinson’s disease (PD) and multiple system atrophy–parkinsonian type (MSA-P), corticobasal degeneration (CBD), and progressive supranuclear palsy (PSP), collectively termed atypical Parkinsonism (AP), is challenging. Dopamine transporter density imaging with Ioflupane I123 (DaTscan) is a marker of presynaptic nigrostriatal dysfunction. The primary aim of this study was to investigate the utility of DaTscan in the differential diagnosis of MSA-P, CBD, and PSP.
Methods
Patients examined at Eginition Hospital (2011–2021), with available DaTscan data and a diagnosis of probable AP, clinically established PD, as well as a neurological control (NC) group were included. Mean binding specific index (BSI), BSI of the most affected side, asymmetry index, laterality, and caudate/putamen ratio were recorded. Analyses were performed by Kruskal-Wallis and ANCOVA.
Results
137 patients were included (CBD: \(n =28\); MSA-P: \(n =15\); PSP: \(n =42\); PD: \(n =17\); NC: \(n =35\)). There were significant differences when comparing CBS, PSP, and NC vs. all other groups combined. Pairwise between-group comparisons revealed significant differences between PSP and CBD (mean striatum BSI>1.95; sensitivity 74.1%; specificity 85.0%), CBD and MSA-P (mean striatum BSI>2.04; sensitivity 70.4%; specificity 86.7%), and CBD and PD (mean striatum BSI>2.11; sensitivity 66.7%; specificity 100.0%). There were no differences between PSP, MSA-P, and PD. PSP, MSA-P, and PD differed from NC subjects, with 100% specificity and high sensitivity. Differentiation of NC from CBD was suboptimal.
Discussion
CBD patients exhibit relatively mild DaTscan abnormalities. DaTscan may assist in the differentiation of CBD from PSP. DaTscan does not differentiate among PD, MSA-P, and PSP.
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Data availability
The data that support the findings of this study are available from the corresponding author upon reasonable request.
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The study was performed according to the ethical guidelines of the 1964 Declaration of Helsinki and was approved by the Scientific and Ethical Committee of Eginition Hospital.
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Constantinides, V.C., Souvatzoglou, M., Paraskevas, G.P. et al. Dopamine transporter SPECT imaging in Parkinson’s disease and atypical Parkinsonism: a study of 137 patients. Neurol Sci 44, 1613–1623 (2023). https://doi.org/10.1007/s10072-023-06628-9
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DOI: https://doi.org/10.1007/s10072-023-06628-9