Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The multifocal airspace opacification appears slightly improved in some areas , but then slightly worsened other areas ( this may be technical in nature ) . No pneumothorax . No significant effusion . Background interstitial thickening unchanged . Cardiomegaly unchanged . Endotracheal tube in situ with the tip at the level of the medial clavicles 56 mm proximal to the carina . Feeding tube in situ . Previous right shoulder reverse arthroplasty prosthesis in situ .
    OUTPUT:
    
Multi focal airspace opacification has slightly decreased in density in some areas , but increased in density hilar areas ( this may be technical in nature ) but the overall appearance is unchanged . Background mild pulmonary edema unchanged .