Surgical and Radiologic Anatomy

, Volume 40, Issue 6, pp 635–640 | Cite as

Five mental foramina in the same mandible: CBCT findings of an unusual anatomical variant

  • Andrea Borghesi
  • Stefania Pezzotti
  • Giorgio Nocivelli
  • Roberto Maroldi
Anatomic Variations


The mental foramen is an important anatomic landmark located on the buccal aspect of the mandible, typically near the apex of the second premolar. Mental foramina exhibit many anatomical variations, including differences in size, shape, position, and number. The most frequent type of variation in number is the presence of double mental foramen, which has a reported incidence ranging from 1.4 to 12.5%. The incidence of triple mental foramen ranges from 0.7 to 1.2%. The frequency of accessory mental foramina varies among ethnic groups, with a low incidence in white Caucasian populations. At present, cone beam computed tomography (CBCT) is the diagnostic tool of choice for examining the maxillofacial region, and the high spatial resolution of CBCT allows accurate three-dimensional analysis of mental foramen variations. The present report describes an unusual case of five mental foramina in a 24-year-old white European male diagnosed by CBCT.


Mental foramen Anatomic variation Accessory mental foramen Mandible Cone-beam computed tomography 


Author contributions

AB: Project development, data analysis, manuscript writing and editing. SP: Data collection, literature research and manuscript editing. GN: Literature research and manuscript editing. RM: Manuscript editing.

Compliance with ethical standards

Conflict of interest

The authors declare no financial or other conflict of interest.


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Copyright information

© Springer-Verlag France SAS, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Radiology, Medical SchoolUniversity of BresciaBresciaItaly

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