Osseous anomalies of the craniovertebral junction: a case report.

The authors describe the principal anomalies of the craniovertebral junction with particular reference to atlantooccipital fusion. They discuss the case of a female patient with pain and cervical contracture in whom a paracondylar process was revealed. Unless trauma brings it out, this abnormality can go unnoticed. CT scan is the only examination useful for diagnosis.