Achondrogenesis type 1A (ACG1A), a form of achondrogenesis (see this term), is a very rare, lethal skeletal dysplasia characterized by dwarfism with extremely short limbs, narrow chest, short ribs that are easily fractured, soft skull bones and distinctive histological features of the cartilage. The disease is Achondrogenesis type 1A (Orphanet_93299, an Orphanet rare-disease nomenclature identifier). Also known as: Achondrogenesis, Houston-Harris type.