Extrastriatal ¹²³I-FP-CIT SPECT impairment in degenerative parkinsonisms.

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IntroductionNeuropathological data and nuclear medicine imaging show extensive serotonergic impairment in Parkinson's disease (PD) and atypical parkinsonian syndromes (APS). The study aims at performing a case-controlled region-of-interest (ROI)-based analysis of 123I-N-ω-fluoropropyl-2β-carbomethoxy-3β-(4-iodophenyl) nortropane (123I-FP-CIT) images to measure extrastriatal regional deficits in PD and APS, and assess their added diagnostic value in discriminating degenerative parkinsonisms from other conditions.MethodsWe included 157 patients with early degenerative parkinsonism (mean age 72.6 years, 44% female, mean disease duration at scan 1.6 years), i.e. PD (n = 59), multiple system atrophy parkinsonian variant (MSA-P, n = 17), progressive supranuclear palsy (PSP, n = 28), corticobasal syndrome (CBS, n = 19), dementia with Lewy bodies (DLB, n = 34) as well as 58 similarly-aged control participants. 123I-FP-CIT SPECT images were processed with statistical parametric mapping 12 (SPM12)-based PETPVE12 software and subjected to partial volume effect correction for ROI-based group comparisons.ResultsRelative to controls, all forms of degenerative parkinsonism showed decreased 123I-FP-CIT uptake in caudate nucleus, putamen but also pallidum and insula. In addition, a significant uptake reduction was observed in thalamus for MSA-P and PSP, in midbrain for PD and PSP, and in the amygdala for PSP (ANCOVA controlling for age, sex and antidepressant medication, all Bonferroni-corrected p ConclusionThis study provides evidence of a major extrastriatal 123I-FP-CIT impairment, and therefore of an altered serotonergic transmission in PD and APS, confirming previous neuropathological and SERT imaging findings.

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