Maria Stamelou is Professor of Neurology at Philipps University, Marburg, Germany and Head of Parkinson's disease and Movement Disorders Department at HYGEIA Hospital in Athens,Greece Günter U. Höglinger is at Technical University Munich, Germany

• How to approach a patient with Parkinsonism- red flags for atypical parkinsonismEoin Mulroy, Maria Stamelou, and Kailash P. BhatiaPart 1: The ‘classic’ atypical parkinsonian disordersClassification of atypical Parkinsonism per pathology versus phenotypeGesine Respondek, Maria Stamelou, and Günter HöglingerProgressive supranuclear palsyNikolaos Giagkou,Günter Höglinger, and Maria StamelouCorticobasal degenerationGerard Saranza, Jennifer Whitwell, Gabor Kovacs, and Anthony LangMultiple system atrophy in Parkinsonism beyond Parkinson’s diseaseAlessandra Fanciulli, Iva Stankovic, Florian Krismer, Klaus Seppi, Johannes Levin, and Gregor K. WenningPart 2: Atypical parkinsonism in other sporadic and genetic neurodegenerative diseases‘Atypical’ Parkinson’s disease - sporadicKirsten E. Zeuner and Daniela BergGenetic ‘atypical’ Parkinson’s diseaseAnne Weißbach, Christina Wittke, Meike Kasten, and Christine KleinAtypical Parkinsonism in other sporadic and genetic neurodegenerative diseases Alzheimer disease (sporadic and genetic) Alzheimer disease (sporadic and genetic) Johannes Levin Parkinsonism in frontotemporal dementiasJames B. Rowe Parkinsonism in neurodegenerative diseases predominantly presenting with ataxiaMatthis SynofzikParkinsonian signs in Huntington's disease – impact on diagnosis and managementRalf ReilmannParkinsonism in diseases predominantly presenting with DystoniaAlessio Di Fonzo, Giulia Franco, Paolo Barone, and Roberto ErroGenetic mimics of the non-genetic atypical parkinsonian disorders-the ‘atypical’ atypical Nikolaos Giagkou, Kailash P. Bhatia, Gunter Höglinger, and Maria StamelouPart 3: Secondary parkinsonismParkinsonism in neurometabolic diseasesMiryam CarecchioSecondary parkinsonism due to drugs, vascular lesions, tumors, trauma, and other insultsMatthias HöllerhageParkinsonism in autoimmune diseases Chrysanthi Barba and Haris Alexopoulos