Radiology · single question
On a periapical radiograph of the anterior maxilla, what is the line visible in the MIDDLE third of the anterior teeth that appears as a radiolucent shadow?
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Correct answer: A. Nose shadow / nasal fossa shadow
A) Nose shadow (nasal fossa shadow) — CORRECT.
The nasal fossae project as bilateral radiolucent areas over the apical/middle thirds of the maxillary anterior teeth on periapical radiographs. The soft tissue of the nose creates a shadow that can be mistaken for pathology. This is a normal anatomic landmark — no arrow may be present to guide you, requiring anatomical knowledge.
B) Incisive foramen: A single midline radiolucency at the apex of the maxillary central incisors — not a bilateral shadow in the middle third.
C) Suture: The intermaxillary suture appears as a thin midline radiolucent line — not the lateral shadow described.
D) Mental foramen: Located in the mandible near the premolars — not relevant to maxillary anterior teeth.
The nasal fossae project as bilateral radiolucent areas over the apical/middle thirds of the maxillary anterior teeth on periapical radiographs. The soft tissue of the nose creates a shadow that can be mistaken for pathology. This is a normal anatomic landmark — no arrow may be present to guide you, requiring anatomical knowledge.
B) Incisive foramen: A single midline radiolucency at the apex of the maxillary central incisors — not a bilateral shadow in the middle third.
C) Suture: The intermaxillary suture appears as a thin midline radiolucent line — not the lateral shadow described.
D) Mental foramen: Located in the mandible near the premolars — not relevant to maxillary anterior teeth.