[The thoracic radiologic significance of the width of the azygous vein and its correlation with right atrial blood pressure].

The widths of the azygos vein were measured in 150 patients and correlated with the pressure in the right heart-atrium. We found a significant logarithmic correlation (r = 0.8) between the two parameters. Radiologic measurement of the width of V. azygos in chest radiographs or CT is useful to evaluate the function of the right heart.