Pseudofractures due to Nec-Loc cervical immobilization collar.

The plastic rivets attached to the commonly used Nec-Loc cervical immobilization collar produce linear lucencies which often traverse the cervical vertebrae. Linear lucencies in this location often simulate a fracture. In most instances, the complete outline of the object causing the artifact may be identified. However, identification may not be possible in all cases. Radiologists should familiarize themselves with the appearance of the artifact produced by this particular immobilization device so as to avoid the erroneous diagnosis of a cervical fracture. Whenever the diagnosis is in doubt, the collar should be removed and a repeat radiograph should be obtained.