Brachydactyly type C is a very rare congenital condition that is characterized by shortening of certain bones in the index, middle and little fingers. The bones of the ring finger are typically normal. Other abnormalities may also be present such as hypersegmentation (extra bones) of the index and middle fingers; ulnar deviation (angled towards the fifth finger) of the index finger; and unusually-shaped bones and/or epiphysis (end of a long bone). Brachydactyly type C is typically caused by changes in the GDF5 gene and is inherited in an autosomal dominant manner.