Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Tracheostomy tube , feeding tube , and left subclavian central venous catheter are unchanged in position . Left upper lobe parenchymal cavitary opacities are similar , perhaps slightly decreased from the prior study . The bases are better aerated bilaterally with decrease in retrocardiac opacification . Trace left pleural effusion may be present . Cardiac size and cardiomediastinal silhouette are unchanged .
    OUTPUT:
    
Perhaps slight decrease in left upper lobe opacity with trace left pleural effusion .