Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged including cardiomegaly . The lung volumes are low . The right costophrenic angle is obscured suggesting a small pleural effusion . Right lateral pleural thickening appears stable . There is probably also a small pleural effusion on the left side . Patchy opacity at the left lung base has decreased and probably is due to minor atelectasis or scarring . A mild interstitial process is similar to the prior study and could be seen with mild pulmonary edema , although chronicity is uncertain since it is not a substantial change . Carotid bulb calcifications are present bilaterally .
    OUTPUT:
    
Similar mild interstitial abnormality suggesting mild pulmonary edema although , given the lack of change , acuity is uncertain .