An autosomal dominant malformation syndrome caused by mutations in TRPS1 characterized by distinctive craniofacial and skeletal abnormalities. TRPS I patients have sparse scalp hair, bulbous tip of the nose, long flat philtrum, thin upper vermilion border, and protruding ears. Skeletal abnormalities include cone-shaped epiphyses at the phalanges, hip malformations, and short stature.