An anatomical radiolucency of the cervical spine.
A radiolucency in the cervical spine consistently seen on panoramic dental radiographs has been investigated. It was found to arise from the axis and be caused by a combination of its unique morphology and the oblique angle of incidence of the X-ray beam in the first part of its rotation.
Taylor
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D001368:Axis, Cervical Vertebra / Q000000981:diagnostic imaging*; D001270:Cervical Atlas / Q000000981:diagnostic imaging*; D006801:Humans; D011862:Radiography, Panoramic