Hypochondrogenesis

**Definition:** A condition caused by failure of the skeletal system to correctly develop during the antenatal period, due to mutation of the COL2A1 gene. This condition is characterised by a small body, short limbs, underdeveloped lungs, flat and oval-shaped face, hypertelorism, micrognathia, enlarged abdomen, and ossification in the spine and pelvis. This condition may also present with a cleft palate.