Figure 16c. Images in a 14-year-old male adolescent with a dentigerous cyst in an unerupted left cuspid. (a) Orthopantomogram shows the dentigerous cyst (arrowheads) twice because of distortion near the midline. Note that the root of the retained primary cuspid (baby tooth) on the left (short arrow) is much shorter than the root of the permanent cuspid on the right (long arrow). (b) Panoramic dental CT scan better delineates the unerupted left cuspid with the dentigerous cyst (arrowheads) that surrounds the crown of tooth. The primary left cuspid with a short root (short arrow) and the permanent right cuspid (long arrow) are again depicted. (c) Cross-sectional dental CT images show the relation of the lesion to the right (R) and left (L) central incisors. Note that the cyst (arrowheads) abuts the roots but does not cause resorption. (Reprinted, with permission, from reference 7.)