Parkinson Disease [Disease/Finding] Parkinson Disease, Idiopathic Primary Parkinsonism 1022466 Paralysis Agitans Lewy Body Parkinson Disease Idiopathic Parkinson's Disease N0000002327 Parkinson Disease Lewy Body Parkinson's Disease Parkinson Disease A progressive, degenerative neurologic disease characterized by a TREMOR that is maximal at rest, retropulsion (i.e. a tendency to fall backwards), rigidity, stooped posture, slowness of voluntary movements, and a masklike facial expression. Pathologic features include loss of melanin containing neurons in the substantia nigra and other pigmented nuclei of the brainstem. LEWY BODIES are present in the substantia nigra and locus coeruleus but may also be found in a related condition (LEWY BODY DISEASE, DIFFUSE) characterized by dementia in combination with varying degrees of parkinsonism. (Adams et al., Principles of Neurology, 6th ed, p1059, pp1067-75) 49049000 D010300 Idiopathic Parkinson Disease M0015963 C4832 Parkinson's Disease, Lewy Body Parkinson's Disease C0030567 Parkinson's Disease, Idiopathic Neurodegenerative Diseases [Disease/Finding] Parkinsonian Disorders [Disease/Finding]