A patient with periodontitis diagnosed two years ago (who never completed the recommended scaling/root planing) now has deep periodontal pockets, bone loss, pain, and a periapical radiolucency. What type of lesion is this?

This presentation — long-standing, untreated periodontal disease (deep pockets, bone loss) now combined with a new periapical (endodontic-origin) radiolucency — describes a combined endodontic-periodontal lesion, where both disease processes are present and may even communicate, rather than a purely periodontal or purely endodontic problem alone.