Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Semi-upright portable view of the chest demonstrates low lung volumes . There was minimal blunting of the costophrenic angle suggestive of trace pleural effusions . Hilar and mediastinal silhouettes are unchanged . Heart is mildly enlarged . There is no pneumothorax . There is mild pulmonary edema , minimally progressed since prior . Post - surgical changes related to the sternotomy wires and CABG are again noted . Multiple surgical clips are again seen projecting over right axilla . Partial imaged upper abdomen is unremarkable .
    OUTPUT:
    
Low lung volumes . Mild cardiomegaly and pulmonary edema and possible trace pleural effusion , slightly increased since ___ .