Mental deficiency occurs in some cases.
Upslanting palpebral fissures. Foot abnormalities include small and irregular tarsal bones, ivory epiphyses, hypoplastic middle and distal phalanges, and calcaneo-valgus positioning. Coxa valga, small femoral epiphyses, and hip abduction. Platyspondyly with irregular plates of vertebrae and lordosis. The syndrome is familial and is transmitted as an autosomal recessive trait.