2 type disproportionate anterocollis in Parkinson syndromes

Neurology 2020 AAN PO1.274  Clinical subtypes of disproportionate anterocollis in parkinsonian syndromes Revuelta G, Factor S. 


Myopathic subtype-- neck extensor weakness and limited range of motion, neck extensor myopathy on EMG,


dystonic subtype-- no weakness, full range of motion, laterocollis/torticollis and hypertrophy.