How to approach a patient with Parkinsonism- red flags for atypical parkinsonism Eoin Mulroy, Maria Stamelou, and Kailash P. Bhatia Part 1: The classic atypical parkinsonian disorders Classification of atypical Parkinsonism per pathology versus phenotype Gesine Respondek, Maria Stamelou, and Gunter Hoglinger Progressive supranuclear palsy Nikolaos Giagkou,Gunter Hoglinger, and Maria Stamelou Corticobasal degeneration Gerard Saranza, Jennifer Whitwell, Gabor Kovacs, and Anthony Lang Multiple system atrophy in Parkinsonism beyond Parkinsons disease Alessandra Fanciulli, Iva Stankovic, Florian Krismer, Klaus Seppi, Johannes Levin, and Gregor K. Wenning Part 2: Atypical parkinsonism in other sporadic and genetic neurodegenerative diseases Atypical Parkinsons disease - sporadic Kirsten E. Zeuner and Daniela Berg Genetic atypical Parkinsons disease Anne Weibach, Christina Wittke, Meike Kasten, and Christine Klein Atypical Parkinsonism in other sporadic and genetic neurodegenerative diseases Alzheimer disease (sporadic and genetic) Alzheimer disease (sporadic and genetic) Johannes Levin Parkinsonism in frontotemporal dementias James B. Rowe Parkinsonism in neurodegenerative diseases predominantly presenting with ataxia Matthis Synofzik Parkinsonian signs in Huntington's disease impact on diagnosis and management Ralf Reilmann Parkinsonism in diseases predominantly presenting with Dystonia Alessio Di Fonzo, Giulia Franco, Paolo Barone, and Roberto Erro Genetic mimics of the non-genetic atypical parkinsonian disorders-the atypical atypical Nikolaos Giagkou, Kailash P. Bhatia, Gunter Hoglinger, and Maria Stamelou Part 3: Secondary parkinsonism Parkinsonism in neurometabolic diseases Miryam Carecchio Secondary parkinsonism due to drugs, vascular lesions, tumors, trauma, and other insults Matthias Hollerhage Parkinsonism in autoimmune diseases Chrysanthi Barba and Haris Alexopoulos