Fig. 1a–d

Skeletal features change with age. a A pseudoachondroplasia patient aged 6. Short-limbed short stature resembling achondroplasia, but the patient is of normal facies. b Lateral radiograph of the spine aged 6 showing the “anterior tongue-like protrusion” appearance (red arrow). c The same patient aged 17. The short stature and deformity of extremities have become more conspicuous. d Lateral radiograph of the spine aged 17. The characteristic feature has disappeared