Cross-Table Cervical Spine in an Intubated Trauma Patient
You are working a night shift in a level II trauma center. A 34-year-old restrained driver is brought in after a rollover. He is intubated, GCS 14, and immobilized with a rigid cervical collar, head blocks, and a backboard. The trauma team suspects a C5 injury. CT is ordered, but the scanner is tied up with another trauma for about 45 minutes. The ED attending asks you to "get a quick cross-table lateral and an AP before CT so we have something." The patient's mouth is closed around the endotracheal tube, the collar cannot be removed, and he is 185 cm and 100 kg with thick shoulders. A nurse asks whether you can "just skip the lateral and do the odontoid."
1. Describe how you would obtain the cross-table lateral and what makes it adequate.
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Keep the collar, head blocks, and backboard in place; do not rotate or distract the neck. Place the image receptor vertically against the lateral neck and shoulder, as close to the anatomy as the collar allows, and direct the beam horizontally from the opposite side. Use a long SID (about 180 cm) to reduce magnification, collimate to include the skull base through the C7-T1 junction, and use an air gap rather than a grid if the cassette cannot be positioned close enough. A slight cephalad tube angulation can help project the shoulders inferiorly. Adequacy criteria: all seven cervical vertebrae plus the C7-T1 junction visible, true lateral with superimposed mandibular angles and posterior ribs, no rotation, no motion, and adequate penetration of the shoulder region. Label the image as a cross-table lateral. If any criterion fails, say so rather than letting the film imply clearance.
2. Should you attempt the open-mouth odontoid view? Should the plain films delay CT?
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No. The open-mouth odontoid requires mouth opening and an unobstructed view; with an endotracheal tube in place and a rigid collar that cannot be removed, the view will be nondiagnostic at best and would require manipulating the collar at worst. The nurse's suggestion to skip the lateral and "just do the odontoid" inverts the priorities. The lateral is the more useful portable view, and even it does not clear the spine. Plain films should not delay CT in a high-risk mechanism with a suspected C5 injury: CT is the standard for cervical spine evaluation in this patient, and a 45-minute scanner delay is acceptable while the patient is monitored. Tell the ED attending what you can realistically provide, that the films are adjuncts only, and confirm the CT remains scheduled. Document the conversation and the immobilization maintained throughout.
3. The lateral shows C1 through C6 but not the C7-T1 junction. What are your next steps, and what must you not do?
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First, do not pull on the collar, tilt the head, or rotate the neck to chase the junction, and do not remove the collar for a better view. Options that do not move the spine include repeating the cross-table lateral with adjusted tube angulation and exposure, or attempting a swimmer's view only if the trauma protocol permits it and the arm can be positioned without moving the cervical spine. Even when these succeed, they do not clear the spine in a patient with this mechanism. The correct next step is to document that the C7-T1 junction is not visualized, tell the ED attending and the radiologist, and proceed with CT as the definitive study. A technically limited lateral must never be reported or implied as a normal or cleared cervical spine.