VARIATIONS OF THE POSTERIOR CONDYLAR CANALS

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BACKGROUND: To assess prevalence, normal anatomic patterns and variations of the condylar canal as the variations in course of vessels and in foramina of skull have importance for their correct identification as normal or abnormal. METERIALS AND METHODS: 64 skulls were examined by direct observation from the Anatomy deparments of the various medical colleges of Gujarat for the unilateral or bilateral presence or absence of the canal and for the presence of multiple canals or any other variations. RESULTS: The condylar canal was found bilaterally in 45 skulls (70.31%); unilaterally in 13 skulls (20.31%) and was absent in 6 skulls (9.38%). Double condylar canals were found unilaterally in 5 skulls (7.81%), 2 skulls (3.12%) showed septation in the posterior condylar canal. A higher prevalence of Intrasinus canal type was found (71.88%). Retrosinus canal type was found 8.59%. CONCLUSIONS: The posterior condylar canal in the occipital bone showed some differences, which may accompany variations in the posterior condylar veins. Knowledge of the anatomical relationships and variations of these veins is necessary not only for radiological diagnosis, but also when considering surgical or endovascular treatment of skull base diseases.

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