IJAR.2017.299

Type of Article:  Original Research

Volume 5; Issue 3.2 (August 2017)

Page No.: 4251-4256

DOI: https://dx.doi.org/10.16965/ijar.2017.299

VARIATIONS OF ARCH OF AZYGOS VEIN: AN ANATOMICAL OVERVIEW WITH CLINICAL IMPORTANCE

Ananthachar Yathi Raghavendra 1. Santosh Manohar Bhosale *2.

1 Associate Professor, Department of Anatomy, S.S.Institute Of Medical Sciences, Davangere, Karnataka, India.

*2 Associate Professor, Department of Anatomy, S.S.Institute Of Medical Sciences, Davangere, Karnataka, India.

Corresponding Author: Dr. Santosh Manohar Bhosale, Associate Professor, Department of Anatomy, S.S. Institute of Medical Sciences, Davangere- 577005, Karnataka, India. Mobile No: 9945316042 E-Mail: drsantoshbhosale07@mail.com

ABSTRACT:

Background: The azygos venous system represents an accessory venous pathway supplying an important collateral circulation between the superior and inferior vena cava. The azygos vein is a collateral venous pathway, becoming a vital shunt if major pathways of venous return are obstructed.

Material and Methods: A total of 36 cadavers and dissected specimens were studied. A thorough dissection of the mediastinum was done after the removal of heart and the lungs. The shape, level of termination, dimensions and course & relations of arch of azygos vein was noted on the right side. The diameter of the inferior vena cava was also measured.

Observations and Results: most commonly the arch forms an inverted U shaped course. 89% of the case the azygos vein was opening into extra-pericardial part of superior vena cava at a mean distance of 42.5mm from the formation In 19 (53%) cases out of 36 it was opening into superior vena cava at the level of T4. Next commonest level of opening (14%) was at the junction of T3-T4. length varied from 28 to 48 mm. The mean width of IVC was 18 mm +/- 3.5mm. It was observed that the diameter of IVC is inversely proportional to width of azyos vein.

Conclusion: In the present study the normal variations of the morphometry of azygos vein is noted. It is clear that the diameter of SVC is inversely proportional to that of Azygos vein.

Key wods: Arch, Azyos vein, Inferior Vena Cava, Superior Vena Cava.

REFERENCES

  1. Terrence C. Demos, Harold V. Posniak, Kenneth L. Pierce, Mary C. Olson,Mark Muscato. Venous Anomalies of the Thorax . American Journal of Roentgenology 2004;182(5): 1139-1150.
  2. Carpentier, Bertaux. Anomalie des systèms de la veine cave inferieure et des veines azygos, observée chez un homme adulte. Soc. Biol., Comptes Rendus Hebdomadaires de Séances et Mémoires. 1888;40:339-340.
  3. Myung Soo Shin, Kang Jey Ho. Clinical significance of azygos vein enlargement: Radiographic recognition and etiologic analysis. Clinical Imaging 1999;23(4):236–241.
  4. R. Heitzman, J. V. Scrivani, J. Martino and J. Moro. The Azygos Vein and Its Pleural Reflections. RSNA Radiology November 1971;101(2):22-23.
  5. Dudiak CM, Olson MC, Posniak HV. CT evaluation of congenital and acquired abnormalities of the azygos system. Radiographics. 1991;11:233–246.
  6. Francesco Paoletti, Valeria Pellegrino, Melissa Antonelli, Umberto Ripani, Stefano Mosca, Davide Durì, Antonio Galzerano. Compensatory dilatation of the Azygos Venous system Secondary To Superior Vena Cava Occlusion. Journal of Radiology Case Reports 2009 Dec;3(12):49-55.
  7. Dahran, N. & Soames, R. Anatomical variationos of the azygos venous system: Classification and clinical relevance. J.Morphol., 2016;34(3):1128-1136.
  8. Kanchana latha G., Raju Sugavasi. Study of the Azygos System of Veins in Human Cadaver. Int J Cur Res Rev April 2013;05(08):115-7.
  9. Tatar I , Denk CC, Celik HH, Oto A, Karaosmanoglu DA, Ozdemir BM, Surucu SH.. Anatomy of the azygos vein examined by computerized tomography imaging.. Saudi Med J 2008;29(11):15858.
  10. Kutoglu, M. Turut, N. Kocabiyik, H. Ozan, M. Yildirim. Anatomical analysis of azygos vein system in human cadavers. Rom J Morphol Embryol 2012;53(4):1051–1056.
  11. Arango, A. Martínez de Alegría, M. C. Ageitos Casais etal. Azygos vein and Azygos lobe: Anatomy, variants and pathology.. European Society of Radiology 2013;C-1212: 1-26.
  12. M R Prince, R A Novelline, C A Athanasoulis, and M Simon. The diameter of the inferior vena cava and its implications for the use of vena caval filters. RSNA Radiology 1983;149(3):687-9.
  13. Dudiak C. M, Olson M. C, Posniak H. V. CT evaluation of congenital and acquired abnormalities of the azygos system. Radiographics March 1991;11:233-246.
  14. Sato Y, Murata K, Wada A, Takamori M. Azygos Vein Aneurysm Mimicking a Calcified Lymph Node. Internal Medicine. 2016;55(22):3405-3406.

Cite this article: Ananthachar Yathi Raghavendra. Santosh Manohar Bhosale. VARIATIONS OF ARCH OF AZYGOS VEIN: AN ANATOMICAL OVERVIEW WITH CLINICAL IMPORTANCE. Int J Anat Res 2017;5(3.2):4251-4256. DOI: 10.16965/ijar.2017.299