Parkinsonian disorder

In medical neurology, Parkinsonian disorders share features with Parkinson disease. "The four primary symptoms of PD are tremor, or trembling in hands, arms, legs, jaw, and face; rigidity, or stiffness of the limbs and trunk; bradykinesia, or slowness of movement; and postural instability, or impaired balance and coordination". In other words, Parkinson's disease is a Parkinsonian disorders, but not all Parkinsonian disorders are true Parkinson's disease.

Formally, they are "a group of disorders which feature impaired motor control characterized by bradykinesia, muscle rigidity; tremor; and postural instability. Parkinsonian diseases are generally divided into primary Parkinsonism, secondary Parkinsonism and inherited forms. These conditions are associated with dysfunction of dopaminergic or closely related motor integration neuronal pathways in the basal ganglia."