en Basic Neurosurgery Case report <p><strong>Background and Aim:</strong> The third occipital condyle (TOC) is an infrequent anatomical variation of the occipital bone that may imitate an occipital condyle (OC) fracture.</p> <p><strong>Case Presentation</strong>: Herein, we present an uncommon case of condylus tertius in a 33-year-old man with trauma with unilateral pain on motion (POM) and limitation of motion (LOM) of the head and neck without neurological deficits. The patient with a diagnosis of condylus tertius underwent conservative treatment with a Philadelphia collar and medical therapy. After two months of followup, he had a complete recovery of post-traumatic neck symptoms.</p> <p><strong>Conclusion:</strong> The TOC is an infrequent anatomical variation of the occipital bone that may imitate an OC fracture in trauma cases with good response to conservative treatment for post-traumatic symptoms and unknown effect of the occasional median joint of the TOC with C1 and or dens of axis as reinforcement of the craniovertebral region or hampering the motions of the head and neck</p> Condylus tertius, Third occipital condyle (TOC), Trauma, Neck pain 0 0 http://irjns.org/browse.php?a_code=A-10-400-17&slc_lang=en&sid=1 Ali Kazeminezhad kazemimd@msn.com 100319475328460013211 100319475328460013211 Yes Department of Neurosurgery, Peymanieh Hospital, Jahrom University of Medical Sciences, Jahrom, Iran. Navid Kalani navidkalani@ymail.com 100319475328460013212 100319475328460013212 No Research Center for Social Determinants of Health, Jahrom University of Medical Sciences, Jahrom, Iran.