Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable upright AP image of the chest . The lungs are well expanded . Mild interstitial markings and cardiomegaly are consistent with mild pulmonary edema , improved from prior exam . The left upper lobe known mass is not well visualized on this exam due to overlying wires . No other focal pulmonary lesion is seen . There is no left pleural effusion . There may be a small right pleural effusion . There is no pneumothorax .
    OUTPUT:
    
Minimal residual pulmonary edema , improved from prior exam .