Functional Movement Disorder and Parkinson's Disease Comorbidity: A Case Report.

Functional movement disorders (FMD) are abnormal involuntary movements that are not attributable to known neurological and neuroanatomical causes. In the past decade, FMD diagnoses have been based on positive factors that are inconsistent with neurological disorders and not on the exclusion of neurological disorders. In this report, we presented the case of a female patient who had been followed up for 4 years in multiple health centers with the diagnosis of a neurological disorder which was suspected in the previous 1 year to be of psychogenic origin. A neurological disorder comorbid with depression and FMD was diagnosed after admission as an inpatient to our clinic. By presenting this case, it was intended to emphasise the importance of follow up after diagnosing FMD, given its common basis with Parkinson's disease and the high incidence of comorbidites seen with it. Imaging and elecrophysiological techniques should be relied upon.for differentiating FMD and neurological diseases. Although psychological causes are significant disease risk and/or maintenance factors, they are not sufficient for explaining the aetiology of FMD, which requires a multidisciplinary approach. Keywords: Functional movement disorders, Parkinson's disease, DaTscan.