Chorea, Benign Familial

Both a dominant (see 118700) and a recessive form may exist. Nutting et al. (1969) described 3 affected sibs out of 5 with phenotypically normal, nonconsanguineous parents. Chun et al. (1973) described 4 affected sibs out of 7, again with normal, unrelated parents. Reduced penetrance in 1 parent is possible. Damasio et al. (1977) described the disorder in a brother and sister with normal parents.