Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is again mild - to - moderately enlarged . The main pulmonary artery contour appears moderately enlarged . The aortic arch is calcified . Opacities at the lung bases have markedly improved , leaving streaky opacities , most prominent at the left retrocardiac region . There is increased interstitial abnormality suggesting mild vascular congestion . There is no pleural effusion or pneumothorax . Mild - to - moderate rightward convex curvature centered along the lower thoracic spine with multilevel mild degenerative changes noted along the lower thoracic levels . The bones appear demineralized .
    OUTPUT:
    
1 . Findings suggesting mild vascular congestion , although somewhat increased . 2 . Marked improvement in basilar opacities with residual streaky opacities , greater on the left than right , suggestive of atelectasis or resolving infection .