Overview

The open mouth odontoid radiograph images the odontoid process and lateral masses of C1 and C2. The patient opens the mouth and the beam is centered through the oral cavity. This view is essential for detecting odontoid fractures and atlantoaxial alignment.

Technique

Instruct the patient to open the mouth wide and align the lower edge of the upper incisors with the base of the skull. Center the detector to the open mouth and use appropriate exposure. Immobilize the head to reduce motion and ensure patient comfort.

Clinical Indications

Odontoid view is indicated for trauma with suspected C1 C2 injury and neck pain. It helps detect fractures of the dens and lateral mass displacement. CT is often used for detailed evaluation when radiographs are limited.

Image Assessment

Assess the odontoid process for cortical disruption and evaluate lateral mass symmetry. Look for atlantoaxial subluxation and prevertebral soft tissue swelling. Report findings and recommend CT for surgical planning when indicated.