Widening of the cervical intervertebral foramen.

Case reports of seven patients in whom unusual abnormalities caused widening of the cervical intervertebral foramen are presented. Plain roentgenographic and tomographic changes may be quite distinctive, especially in a patient with an absent pedicle or a tortuous vertebral artery. However, angiography has proved to be a useful adjunct to determine the etiology in many of these lesions.