Atypical parkinsonism in C9orf72 expansions: a case report and systematic review of 45 cases from the literature

Journal of Neurology
Carlo WilkeMatthis Synofzik

Abstract

While C9orf72 repeat expansions usually present with frontotemporal dementia (FTD) and/or amyotrophic lateral sclerosis (ALS), an increasing number of reports suggests that the primary phenotype of C9orf72 patients may also include movement disorders. We here provide the first systematic clinical characterisation of C9orf72-associated parkinsonism. We report a C9orf72 expansion carrier presenting with a clinical syndrome of progressive supranuclear palsy (PSP), pronounced mesencephalic atrophy on MRI and PSP-characteristic electrooculography findings. Moreover, we systematically review all previous reports on C9orf72 patients with parkinsonian features. Review of 28 reports revealed 45 C9orf72-positive patients with hypokinesia, rigidity and/or resting tremor. C9orf72-associated parkinsonism predominantly consisted in a hypokinetic-rigid syndrome without resting tremor (61%), with both asymmetric (59%) and symmetric (41%) distributions. Additional features included upper motor neuron signs (60%), lower motor neuron signs (36%), cognitive dysfunction (85%), behaviour and/or personality change (55%) and psychiatric symptoms (29%). Vertical supranuclear gaze palsy was reported in three further cases and cerebellar dysfunction in f...Continue Reading

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