SCA 15 presenting with parkinsonism–dystonia, tremor, and psychosis in an Indian woman

Spinocerebellar ataxias (SCAs) represent a diverse group of hereditary and progressive neurological disorders characterized by their onset in adulthood and commonly exhibit autosomal dominant inheritance. These disorders typically involve multiple brain regions, including the cerebellum, spinal cord, basal ganglia, brainstem, and cortical areas, leading to varied and heterogeneous clinical presentations. In particular, SCA 15 is recognized as an adult-onset, slowly progressive cerebellar syndrome, often accompanied by various other neurological manifestations. In this report, we present a novel clinical phenotype of parkinsonism–dystonia syndrome co-occurring with cerebellar features in a genetically confirmed case of SCA 15.