The following table or figure may be downloaded to PowerPoint for personal use in teaching and presentations. This feature is available to all subscribers to the journal.

You MUST read and follow the guidelines at Request to Reproduce AJR Content if you are distributing or using AJR content beyond academic use (limited distribution, non-revenue producing, or educational purposes).

(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)

Fig. 1B. —10-month-old girl involved in motor vehicle crash who suffered closed head injury and who had no cervical spine fracture. Open-mouth odontoid radiograph obtained at same time as A shows apparent lateral displacement of right C1 lateral mass (straight arrow) relative to C2 (curved arrow). Distance between odontoid to C1 lateral mass is wider on right (between dots) than on left (between arrowheads). This finding was misinterpreted as possible C1 ring fracture. This relationship—C1 wider than C2—is normal at this age.