What is the prevalence of multiple system atrophy (MSA)?

Updated: Sep 24, 2018
  • Author: Stephen M Bloomfield, MD; Chief Editor: Selim R Benbadis, MD  more...
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Answer

Answer

The exact incidence of MSA is not known; many experts believe that the disorder is underrecognized. Some authors estimate that 3-10% of patients diagnosed with PD actually have MSA-P, and a prevalence of 16.4 cases per 100,000 population has been reported. In a study in Minnesota from 1976-1990, researchers estimated the average annual incidence of MSA was 3 cases per 100,000 population. A study in rural Bavaria showed a prevalence of 0.31% in the population older than 65 years, a group in which 0.71% had PD.

MSA has a male predominance, as documented in 3 of 4 large studies. One study of 203 patients with histopathologically confirmed MSA demonstrated a male-to-female ratio of 1.3:1.0. The mean patient age at onset is 54.3 years, with a range of 33-78 years. [5]


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