Fahr's Syndrome is a rare inherited neurological disorder

Fahr's Syndrome is a rare inherited neurological disorder that can present with a wide
spectrum of symptoms, including those of Parkinson's Disease. It is characterised by
abnormal deposits of calcium in areas of the brain that control movement, including the basal
ganglia and the cerebral cortex. For more information go to Fahr's Syndrome :
http://www.ninds.nih.gov/disorders/fahrs/fahrs.htm
Symptoms of Fahr's Syndrome that are similar to those of
Parkinson's Disease may include deterioration of motor function,
dementia, dysarthria (poorly articulated speech), tremors, muscle
rigidity, a mask-like facial appearance, shuffling gait, and a
"pill-rolling" motion of the fingers. These symptoms generally
occur later in the development of the disease. More common
symptoms of Fahr's Syndrome include dystonia (disordered
muscle tone) and chorea (involuntary, rapid, jerky movements).
The age of onset of Fahr's Syndrome is typically in the 40s or
50s, which is similar to Parkinson's Disease, although it can also
occur at any time in childhood or adolescence.
Due to the possible similarity of symptoms to those of Parkinson's Disease, Fahr's Syndrome
should be considered as an important differential diagnosis in cases of Parkinsonism.

http://www.viartis.net/parkinsons.disease/news/140609.pdf