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A 60-year-old male is brought in for a dementia evaluation. He is no longer able to feed himself without assistance. On exam he demonstrates bradykinesia, left sided rigidity, postural instability and apraxia. The patient frequently raises his left arm into the air but appears unaware of this action. A brain MRI is notable for cortical atrophy, R > L. Which is the most likely diagnosis?
a) frontotemporal dementia
b) dementia with lewy bodies
c) progressive supranuclear palsy
d) Parkinson’s disease with dementia
e) corticobasal ganglionic degeneration
What is corticobasal ganglionic degeneration?