Radiographic anatomy
Identify normal landmarks, anatomical variants and artefacts before labelling pathology. Compare with clinical findings.
Understand
Normal radiolucencies, canals and foramina can mimic disease. Age, projection and previous surgery change the expected appearance.
Assess
Trace cortical borders, symmetry and anatomical continuity. Compare a suspected lesion with tooth vitality, symptoms and any older image.
Apply
Describe what is actually seen before naming a diagnosis. An apparent mental foramen or incisive canal should not be treated as apical disease without correlation.
Key distinctions
The mental foramen, incisive canal, maxillary sinus floor and nutrient canals can create radiolucencies near roots. Cortication, location and comparison views help; tooth tests and symptoms provide clinical context. Anatomical variants should be described rather than assumed pathological. Conversely, an abnormality cannot be dismissed as a landmark when it expands, changes or lacks expected continuity.
Think through a case
A well-corticated radiolucency near a premolar apex is the mental foramen; the tooth is vital and asymptomatic. Clinical correlation prevents inappropriate endodontics.
The distinction to remember
Do not label a normal landmark pathological from a single projection.
Test your recall
Why can a mental foramen mimic a lesion?
Show answer
It may project near the apex of a premolar.