Achondroplasia

Cranial findings

• relatively large cranial vault with small skull base.
• prominent forehead with depressed nasal bridge
• foramen magnum is narrowed
• cervicomedullary kink
• Relative elevation of the brainstem gives rise to a large suprasellar cistern and a vertically-oriented straight sinus.
• communicating hydrocephalus

Spinal findings

• Posterior vertebral scalloping
• thoracolumbar kyphosis
• short pedicles