Cervical spine and cervicothoracic junction imaging
A complete examination of the cervical spine (cervical spine) requires at least three standard projections:
- Lateral view (lateral view) is the most informative, as it detects up to 90% of all pathologies.
- Anteroposterior view (AP view).
- Transbuccal view through the open mouth (transbuccal view) is essential for visualizing the dens of C2 and the atlantoaxial joints.
The main challenge in radiography of this region is the cervicothoracic junction (cervicothoracic junction). On the lateral view, it is obscured by the massive shadows of the shoulder joints. If the lower cervical vertebrae and the first thoracic vertebra (Th1) are not visible, the swimmer's view (swimmer's view) is performed. To achieve this, the patient raises one arm (adjacent to the cassette) upward while lowering the other along the body, separating the shoulders to different levels.
Thoracic spine imaging features
The thoracic spine (thoracic spine) is a rigid structure. Together with the ribs and sternum, it forms a single bony ring.
Standard anteroposterior and lateral projections are performed. However, image interpretation here is challenging due to the superposition (overlap) effect—the vertebrae are obscured by the shadows of the heart, mediastinal structures, diaphragmatic dome, and ribs.
To improve the quality of the lateral view, the autotomography method is used: the patient is asked to breathe during exposure. The movement of the chest "blurs" the shadows of the ribs and diaphragm, making the contours of the vertebrae clearer. In the presence of scoliosis, the patient is positioned so that the convexity of the curve faces the X-ray film, which allows diverging rays to pass parallel to the disc spaces.
Method limitations in trauma
Although radiography allows for a rapid overview of large spinal segments and helps determine the preliminary level of injury, it is no longer the definitive diagnostic method in severe trauma.
Key drawbacks:
- The method is relatively insensitive to bone fractures (missing more than half of cervical injuries).
- Does not visualize ligaments. The spine can be unstable due to ligamentous disruption (ligamentous disruption) even with a completely normal radiograph.
If X-ray findings are negative, but pain or neurological deficit is present, rigid spinal immobilization and MRI (MRI) are indicated. MRI is the gold standard for assessing the ligamentous apparatus, spinal cord compression, and detecting epidural hematomas.
Functional radiography
The major advantage of conventional X-ray over CT and MRI in outpatient practice is the ability to take images while standing, under axial load.
To detect occult instability, functional views (functional views) are performed. These are lateral radiographs taken in positions of maximum flexion (flexion) and extension (extension). They allow the physician to evaluate abnormal vertebral displacement relative to each other during movement.
The rule for evaluating a lateral neck radiograph is "Seven plus one." If all 7 cervical vertebrae and the first thoracic (Th1) are not visualized on the radiograph, the image is considered uninformative. In this case, a swimmer's view or CT is mandatory.
Class and exam questions
Why must the spine be examined in displaced sternal fractures?
The thoracic spine, ribs, and sternum form a rigid bony ring. Fractures of such rings often occur in more than one place, making a sternal fracture a strict indication to rule out spinal injury.
What to do if an open-mouth view cannot be obtained during trauma?
If the patient is wearing a cervical collar and an adequate transbuccal view is impossible, any doubt should prompt an immediate transition to computed tomography (CT).
Can spinal injury be completely ruled out by X-ray?
No. Radiography cannot completely rule out injuries, especially ligamentous tears that lead to instability without bone fractures.
What else to study on this topic
- Harborview High-Risk Criteria (Indications for Emergency CT)
- Red and Yellow Flags in Low Back Pain
- Imaging Findings After Spinal Fusion (ACDF, PLIF, TLIF) and Cage Placement
- Kümmell's Disease: Avascular Necrosis and Delayed Vertebral Collapse
- Ossification of the Thoracic Ligamentum Flavum ("Japanese Disease")
Master the entire topic in the "Diagnostic Radiology" course
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- Complete Study Guide on "Cervicothoracic Radiography" and 2,199 More Subject Pages
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Other topics in the "Spine" section
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