MONDO_0010966 (achondrogenesis type IB) can be described as follows. Achondrogenesis type 1B (ACG1B), a form of achondrogenesis, is a rare lethal skeletal dysplasia characterized by severe micromelia with very short fingers and toes, a flat face, a short neck, thickened soft tissue around the neck, hypoplasia of the thorax, protuberant abdomen, a hydropic fetal appearance and distinctive histological features of the cartilage. Also known as: achondrogenesis Fraccaro type, achondrogenesis Ib, achondrogenesis, Parenti-Fraccaro type.