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Case Reports in Radiology
Volume 2014, Article ID 537062, 3 pages
Case Report

Three-Dimensional CT Findings of Os Calcaneus Secundarius Mimicking a Fracture

1Department of Radiology, School of Medicine, Yuzuncu Yil University, Dursun Odabaş Medical Center, 65100 Van, Turkey
2Department of Orthopedics, School of Medicine, Yuzuncu Yil University, 65100 Van, Turkey

Received 7 October 2014; Revised 7 December 2014; Accepted 9 December 2014; Published 21 December 2014

Academic Editor: Atsushi Komemushi

Copyright © 2014 Mehmet Deniz Bulut et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Os calcaneus secundarius is one of several accessory ossicles of the foot that have been identified as normal variants of skeletal development. It may cause ankle pain and may mimic an avulsion fracture of the anterior calcaneal process. A twenty-year-old male was admitted to our institution with right ankle pain following an inversion injury. An axial CT image of the patient’s right ankle revealed a shape with smooth and sharp margins, identified as a well-corticated bone fragment in the subtalar region. A diagnosis of an accessory ossicle, os calcaneus secundarius, was made based on radiographic findings. As a result of this case, it is recommended that potential locations of the accessory bones should be well understood in order to prevent misdiagnosis and inappropriate surgical procedures. Os calcaneus secundarius must be considered when an apparent bone fragment or a suspicious fracture line at the anterior region of os calcaneus is demonstrated.