Background and purpose
Drug-induced parkinsonism usually resolves after discontinuation of the causative agent. However, it persists in some patients, who actually have subclinical neurodegenerative parkinsonism. Identification of this condition is important because these patients could benefit from therapeutic measures. The objective of this study was to prove whether transcranial sonography, a technique used in the diagnosis of neurodegenerative parkinsonism, can be used for the said identification.