Achondroplasia is a common skeletal dysplasia characterized by short stature and bone deformities, caused by a mutation in the FGFR3 gene. Patients with this condition are at risk of neurological compression, especially at the craniocervical junction. We present the case of a girl with achondroplasia who suffered a traumatic brain injury, revealing stenosis of the foramen magnum and spinal cord contusion on MRI. Surgical decompression was performed with favorable results.