Anatomical evaluation of the posterior condylar canal: a study on dry adult Thai skulls
Abstract
Background: The posterior condylar canal (PCC) is a crucial structure facilitating venous drainage from the intracranial venous sinuses to the extracranial system. This study aimed to provide anatomical insights into the PCC's prevalence, location of the extracranial and intracranial orifice and diameter, aiding surgical procedures involving the posterior skull base, foramen magnum, and jugular foramen. Materials and methods: Two hundred dry skulls (100 male and 100 female) were examined. The PCC was traced using a flexible wire through its extracranial orifice. Its location was categorized relative to the posterior edge of the occipital condyle (PEOC) into lateral, middle, or medial thirds. The intracranial orifice was classified as intrajugular, intrasinus, or retrosinus. The maximum diameter of the extracranial orifice was measured. Results: The PCC was present in 79.5% of skulls, with bilateral occurrence in 39.5%, right unilateral in 22%, and left unilateral in 18%. In 20.5% of cases, the PCC was absent. A double PCC was observed in a single skull. No statistically significant difference in PCC prevalence was found between sexes. The extracranial orifice was most commonly located in the lateral third of the PEOC (41.4%). The most prevalent intracranial orifice type was intrajugular (46.6%). The average PCC diameter was 3.77 ± 1.0 mm. No statistically significant difference was observed between sides in either extracranial location or intracranial orifice type. Conclusion: Understanding the anatomical variations of the PCC is clinically important for radiologists in interpreting pathological conditions and for neurosurgeons in planning surgeries involving the occipital condyle region.
Keywords: posterior condylar canaldiameterintracranial orificelocationoccipital condyle
References
- Berge JK, Bergman RA. Variations in size and in symmetry of foramina of the human skull. Clin Anat. 2001; 14(6): 406–413.
- Borkute M, Kishore KS. Study of posterior condylar foramen in dry human skulls. In J Clin Anat Physio. 2017; 4(1): 44–7.
- Bayat P, Bagheri M, Ghanbari A, et al. Characterization of Occipital Condyle and Comparison of its Dimensions with Head and Foramen Magnum Circumferences in Dry Skulls of Iran. Intl J of Morphol. 2014; 32(2): 444–448.
- Boyd GI. The Emissary Foramina of the Cranium in Man and the Anthropoids. J Anat. 1930 ;65(Pt1): 108-21. J Anat. 1930; 65(1): 108–121.
- Choudhari S, Thenmozhi MS. Occurrence and Importance of Posterior Condylar Foramen. Research Journal of Pharmacy and Technology. 2016; 9(8): 1083.
- Das S. Sexual Dimorphism and Clinical Importance of Posterior Condylar Canal. National Journal of Clinical Anatomy. 2022; 11(1): 10–16.
- Ginsberg LE. The posterior condylar canal. AJNR Am J Neuroradiol. 1994; 15(5): 969–972.
- HAAS LL. The posterior condylar fossa, foramen and canal, and the jugular foramen. Radiology. 1957; 69(4): 546–552.
- Kothandaraman U, Lokanadham S. Posterior condylar foramen — Anatomical variation. Int J Med Sci Pub Health. 2015; 4(2): 222–224.
- Kumar M. Variations of posterior condylar canal in South Indian skulls. J Pharm Sci & Res. 2015; 7(9): 762–3.
- Lachkar S, Kikuta S, Iwanaga J, et al. The condylar canal and emissary vein-a comprehensive and pictorial review of its anatomy and variation. Childs Nerv Syst. 2019; 35(5): 747–751.
- Matsushima T, Natori Y, Katsuta T, et al. Microsurgical anatomy for lateral approaches to the foramen magnum with special reference to transcondylar fossa (supracondylar transjugular tubercle) approach. Skull Base Surg. 1998; 8(3): 119–125.
- Matsushima K, Kawashima M, Matsushima T, et al. Posterior condylar canals and posterior condylar emissary veins-a microsurgical and CT anatomical study. Neurosurg Rev. 2014; 37(1): 115–126.
- Muthukumar N, Swaminathan R, Venkatesh G, et al. A morphometric analysis of the foramen magnum region as it relates to the transcondylar approach. Acta Neurochir (Wien). 2005; 147(8): 889–895.
- Ota N, Tanikawa R, Yoshikane T, et al. Surgical Microanatomy of the Posterior Condylar Emissary Vein and its Anatomical Variations for the Transcondylar Fossa Approach. Oper Neurosurg (Hagerstown). 2017; 13(3): 382–391.
- Özgören O, Güleç F, Pekçevik Y, et al. Radiological and anatomical evaluation of the posterior condylar canal, posterior condylar vein and occipital foramen. Anatomy. 2016; 9(3): 151–155.
- Pekçevik Y, Pekçevik R. Why should we report posterior fossa emissary veins? Diagn Interv Radiol. 2014; 20(1): 78–81.
- Sadamate N. Anatomical Variations of Posterior Condylar Canal. Journal of Medical Science And clinical Research. 2017; 05(04): 21096–21099.
- Thintharua P, Chentanez V. Morphological analysis and morphometry of the occipital condyle and its relationship to the foramen magnum, jugular foramen, and hypoglossal canal: implications for craniovertebral junction surgery. Anat Cell Biol. 2023; 56(1): 61–68.
- Vanitha, Chandrika Teli, H. S. Kadlimatti. Study on incidence of posterior condylar canal in north harnataka: clinical significance. Int J Clin Surg Adv. 2015; 3(1): 50–4.
- Verma R, Kumar S, Rai AM, et al. The anatomical perspective of human occipital condyle in relation to the hypoglossal canal, condylar canal, and jugular foramen and its surgical significance. J Craniovertebr Junction Spine. 2016; 7(4): 243–249.
- Zahid A, Khan MW, Khan B. Posterior condylar foramen: A study on dried adult Pakistani skulls. J F J M C. 2015; 9(1): 8–12.
