The change in ratio of convex and concave lung volume in XXXX : a 3D CT scan based cross sectional study of effect of severity of curve on convex and concave lung volumes in 99 cases.

@entity1 @entity1615 @entity1513 @entity1635 @entity1515
To study the effect of the degree of @entity1635 , degree of hypokyphosis/ @entity1515 and rotation of apical vertebra on individual lung volume (measured with CT scan) in asymptomatic @entity1615 ( @entity1615 ) @entity1 . Individual (right and left) lung volume, angle of @entity1513 and rotation of apical vertebra, were measured in 77 asymptomatic @entity1615 @entity1 having right thoracic curve, using modern computed tomography (CT) scan. To compare, lung volumes were measured in 22 normal @entity1 (control group). The ratio of "right to left lung volume (convex to concave side)" was obtained and compared among these groups. With increased Cobb's angle, ratio of convex to concave lung volume increased. For Cobb's angle more than 40 degrees, it was increased significantly (P = 0.0042). A significant degree of correlation was found between axial rotation angle of apical vertebra and right to left lung volume ratio (P = 0.0067, r = 0.271). A significant inverse correlation was found between the angle of @entity1513 and right to left lung volume ratio, i.e., as the angle of @entity1513 decreased the convex to concave lung volume ratio increased (P = 0.0109, r = -0.255). In asymptomatic, @entity1615 @entity1 , with increase in degree of curvature, and rotation of apical vertebra, the ratio of convex to concave side lung volume increases; indicating concave side lung volume is comparatively more affected (decreased) than convex side lung volume. On the other hand with decrease in the angle of @entity1513 the convex to concave lung volume ratio increases indicating kyphotic angle has an inverse relation to convex to concave lung volume ratio.
