Internal appearance of the lesion can be determined by the term:

The internal appearance of a lesion can be classified into one of three basic categories: Totally radiolucent Totally radiopaque Mixed radiolucent and radiopaque (mixed density). A totally radiolucent interior is common in cysts, and a totally radiopaque interior is observed in osteomas. The mixed density internal structure is seen as the presence of calcified structures (white) against a radiolucent (black) backdrop. Oral radiology White & Pharaoh 7th edition: page no 277