Thanatophoric dysplasia type 1 (TD1) is a form of TD characterized by short, bowed femurs, micromelia, narrow thorax, and brachydactyly. The disease is thanatophoric dysplasia type 1 (MONDO_0008546, a Monarch Disease Ontology entry). Also known as: TD1, thanatophoric dwarfism type 1, thanatophoric dysplasia, type 1, type 1 thanatophoric dysplasia.