Radiolucency
A dark area on a dental radiograph representing structures that allow X-rays to pass through, typically indicating low-density tissue, air, or pathological lesions.
Full Definition
On a dental radiograph, radiolucent areas appear dark because the X-ray beam passes through them with little attenuation. Healthy pulp chambers, carious lesions, periapical abscesses, and cysts commonly appear radiolucent. Editors reviewing radiology reports must understand that 'radiolucency' is a descriptive radiographic finding and not a diagnosis in itself. The term is frequently paired with anatomical location descriptors (e.g., 'periapical radiolucency', 'interproximal radiolucency'). Its antonym, radiopacity, describes bright white areas such as enamel, bone, and metallic restorations.
Usage
Usage note: Always pair with a location descriptor when editing radiology reports. Do not use as a synonym for 'lesion' without qualification.
In Context
- "A well-defined radiolucency of approximately 8 mm was noted at the apex of the lower left first molar." — Radiographic report
- "The interproximal radiolucency extending into dentine confirmed a Class II carious lesion." — Dental examination note