Achondroplasia is a genetic disorder whose primary feature is dwarfism. Achondroplasia is the most common cause of dwarfism. Dinklage has a form of dwarfism, achondroplasia, which affects bone growth. He was born with achondroplasia, a common form of dwarfism. Williams was born with achondroplasia, a type of dwarfism. Debate exists as to whether this is a result of male dwarfism or female gigantism. Davis was born with spondyloepiphyseal dysplasia congenita, a rare form of dwarfism. Klebba has a form of dwarfism called acromicric dysplasia; he is tall. Hypothyroidism and a number of types of dwarfism occur in beagles. Woolf suffered from a condition called pituitary dwarfism diagnosed at an early age. True dwarfism is often associated with a cluster of physical abnormalities, including pituitary dwarfism. Disorders causing dwarfism are often classified by proportionality. Forms of dwarfism associated with the endocrine system may be treated using hormonal therapy. Its small size is a result of insular dwarfism, a form of allopatric speciation. The incidence of dwarfism and miscarriage also increases as men age.