What does internal resorption typically manifest as on an X-ray?

Internal resorption typically manifests on an X-ray as a large pulp chamber. This occurs when the dentin surrounding the pulp undergoes resorption in response to various stimuli such as trauma or pulpitis. As the internal structure of the tooth changes, the pulp chamber appears enlarged because the dentin, which normally constrains the size of the pulp chamber, is being resorbed. This alteration is significant enough to be visible as an increase in size on radiographic images.

The other options do not accurately represent the typical radiographic features associated with internal resorption. A small radiopaque area does not correlate with internal resorption, as the process involves changes that lead to an increase in radiolucency rather than radiopacity. Blunting of root tips is more indicative of external resorption rather than internal resorption, which specifically affects the inner structures. Darkening of enamel is not a finding associated with internal resorption; it relates more to other dental conditions or issues.