Interpret the developmental anomaly shown in the following radiograph:

Dens invaginatus This anomaly is the result of an infolding of the enamel organ prior to calcification and represents, in its coronal form, an accentuation of the cingulum pit. The anomaly is believed to be genetically determined and has a prevalence of 5%. The maxillary lateral incisors are commonly affected. The condition rarely occurs in the deciduous dentition. Radiological signs The invagination appears as a linear radiopacity at the level of the cingulum. It varies in the degree that it involves the coronal tooth tissue. The tooth may display an open apex and periapical radiolucency as a sequel to loss of pulp vitality. Ref: Interpreting Dental Radiographs by Keith Horner, Jon Rout and Vivian E Rushton