has part has part characteristic of has modifier Skeletal dysplasia The word skeletal dysplasia is most often used to describe a group of over 380 inherited conditions that involve abnormal development of bones and connective tissues. However, the word can also be used to describe the presence of congenital defects of bones or connective tissues that are found in one or more of the diseases, especially on prenatal ultrasound, i.e., a situation in which it is often not yet possible to make an exact etiological diagnosis. This is the sense of the phrase we use in the HPO. It is, however, preferable to annotate the observed abnormalities. Abnormal skeletal morphology abnormal dysplastic skeleton