Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A medial right basilar opacity has fully resolved . A left retrocardiac opacity has mostly resolved , leaving slight patchy residual opacity with volume loss at the left lung base . There is a possible residual pleural effusion on the left side , probably small . There may also be a trace right - sided pleural effusion . There is no pneumothorax . The cardiac , mediastinal and hilar contours appear unchanged , allowing for increased leftward rotation on this study .
    OUTPUT:
    
Marked improvement in lower lung opacities with patchy residual left basilar opacification .