Variations in Azygos Venous System in The Eastern Indian Population: A Cadaveric Study

Background: This study aimed to classify Azygos vein patterns in the Eastern Indian population. Methods: During routine dissection of MBBS 2018–2020 academic year, 20 formalin embalmed cadavers aged 50–70 were used azygos system. The cadaver’s age was verified by its entry into our institute’s anatomy register. register confirmed that all for origin. Though gender not compared this study, it noted record purposes identifying external genitalia and confirming records. These exclusion criteria: 1) No major thoracic surgeries; 2) deformities. Azygos, hemiazygos, accessory hemiazygos veins also examined. Results: Anson & McVay system recruited cadavers’ classified Type-1, Type-2, Type-3. Type 2 again subdivided 5 subgroups Type-3 into2 sub-groups. In one cadaver, Type-1 observed, 17 had Type-2 system, showed Of 3 7 Type-2A -2B, respectively. Similarly, 4 1 2C 2D patterns, Also, 2E type. Type-3, -3A Type-3B. termination vertebral level between T2 T4, T8 T11, T7 T10. Conclusion: variations should be well studied avoid misinterpretation during radiological investigations surgical interventions. KEY WORDS: vein, Hemiazygos Posterior mediastinum, Radiological investigation, Variation.