Noun
St. Vitus's dance; a disease attended with convulsive twitchings and other involuntary movements of the muscles or limbs.
Source: Webster's dictionaryAt the age of eight, Armstrong contracted Sydenham's chorea (then known as St. Vitus' Dance ), an infrequent but serious neurological disorder precipitated by rheumatic fever. Source: Internet
His sister Edith suffered from chorea as a child. Source: Internet