Hypodense corresponds to which radiographic description?

• A. Radiolucent
• B. Radiopaque
• C. Isodense
• D. Hyperdense

Answer: (A)

Density on a radiograph reflects how much X-rays are absorbed. Hypodense areas absorb fewer X-rays, so they appear darker on the image. The term that describes this darker appearance is radiolucent.

In contrast, radiopaque areas block more X-rays and look lighter, while isodense regions have the same brightness as surrounding tissues, and hyperdense areas are even brighter. For example, air or fat are typically radiolucent, whereas bone is radiopaque.