Trichorhinophalangeal syndromes (TRPS) type 1 and 3 has characteristics of short stature, sparse hair, a bulbous nasal tip and cone-shaped epiphyses, as well as severe generalized shortening of all phalanges, metacarpals and metatarsal bones. TRPS types 1 and 3 are variants of a single disease type 3 being at the severe end of the clinical spectrum, with very short stature and very severe brachydactyly. They can be distinguished from type 2 trichorhinophalangeal syndrome by the lack of intellectual deficit and exostoses. TRPS types 1 and 3 are linked to mutations in the TPRS1 gene localised to 8q24.12. Transmission is autosomal dominant.