About CORTICOBASAL DEGENERATION all are true except:
a) CBGD is characterized by frontoparietal cortical atrophy in addition to degeneration within the extrapyramidal system.
b) The disease tends to occur in those aged 60-80 years, with a mean age of onset of 63 years.
c) The substantia nigra is depigmented.
d) Lewy bodies and diffuse neuronal loss are conspicuously present ANS
e) Symptoms on long-term follow-up include focal or asymmetric rigidity, bradykinesia, postural and action tremor, and marked dystonia.