Which type of node appears on the distal interphalangeal joints?

Heberden's nodes are characteristic bony enlargements that occur at the distal interphalangeal (DIP) joints. These nodes are typically associated with osteoarthritis and manifest as hard nodules on the finger joints. The presence of Heberden's nodes indicates a degenerative change in the cartilage and underlying bone at the joint, leading to the formation of these prominent growths.

In contrast, Bouchard's nodes appear at the proximal interphalangeal (PIP) joints, indicating that the placement of these nodes is specific to their respective locations. Osteoarthritic nodules and tophi deposits are not classified specifically for DIP joints; osteoarthritic nodules are a more general term and tophi are associated with gout, appearing in various places, typically around joints but not specific to DIP joints.

Thus, the definitive identification of Heberden's nodes specifically at the distal interphalangeal joints distinguishes them as the correct answer in this scenario.