achondrogenesis type IA (Monarch Disease Ontology identifier MONDO_0008701) can be described as follows. Achondrogenesis type 1A (ACG1A), a form of achondrogenesis, 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. Also known as: achondrogenesis Houston-Harris type, achondrogenesis, Houston-Harris type.