label: achondrogenesis type II
label_lc: achondrogenesis type ii
description: Achondrogenesis type 2 (ACG2), a form of achondrogenesis, is a very rare and lethal skeletal dysplasia and part of the spectrum of type 2 collagen-related bone disorders, characterizedby severe micromelia, short neck with large head, small thorax, protuberant abdomen, underdeveloped lungs, distinctive facial features such as a prominent forehead, a small chin, a cleft palate (in some) and distinctive histological features of the cartilage.