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Updated: Mar 16, 2026

Author Spotlight: Three-Dimensional Cephalometric Landmark Annotation Demonstration on Human Cone Beam Computed Tomography Scans
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Nasopharynx on Cone-beam Computed Tomography.

David MacDonald1, Vera Telyakova1, Montgomery Martin2

  • 1UBC, Faculty of Dentistry, Vancouver, Canada.

International Dental Journal
|March 14, 2026
PubMed
Summary
This summary is machine-generated.

Cone-beam computed tomography (CBCT) can identify nasopharyngeal asymmetry, a potential indicator of cancer. Dentists should be aware of these findings to avoid misdiagnosis and unnecessary referrals.

Keywords:
Cone-beam computed tomographyField of viewNasopharynxSymmetry

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Area of Science:

  • Radiology
  • Oncology
  • Dentistry

Background:

  • Nasopharyngeal carcinoma (NPC) is prevalent in Asian and North African populations.
  • Radiological identification of NPC often involves detecting asymmetry in the Fossa of Rosenmüller (FR) within the nasopharynx.
  • Cone-beam computed tomography (CBCT) is capable of visualizing the nasopharynx and its structures.

Purpose of the Study:

  • To evaluate the utility of CBCT in visualizing the nasopharynx and identifying asymmetry.
  • To determine the prevalence of different Fossa of Rosenmüller (FR) types on CBCT.
  • To inform dental professionals about interpreting nasopharyngeal findings on CBCT.

Main Methods:

  • Eighty-three CBCT scans of the nasopharynx were analyzed.
  • Scans were classified based on the Fossa of Rosenmüller (FR) morphology (Types A, B, C).
  • Nasopharynx shape was compared between supine medical imaging and vertical dental CBCT.

Main Results:

  • Fossa of Rosenmüller (FR) Types A, B, and C were observed with varying frequencies in males and females.
  • Type C (full and open FR) was more prevalent in females.
  • Nasopharynx shape on CBCT was tadpole-shaped, differing from cuboidal shapes in other imaging modalities.

Conclusions:

  • CBCT effectively visualizes the nasopharynx, aiding in the detection of asymmetry, particularly of the Fossa of Rosenmüller (FR).
  • Dentists can recognize these asymmetries, but should exercise caution to prevent false positive referrals.
  • Clinical correlation, including neck examination for lymphadenopathy, is crucial for accurate diagnosis.