Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is stable enlargement of the cardiac silhouette , compatible with mild cardiomegaly . The bilateral hila are normal . There is a suboptimal respiratory effort and low lung volumes . There is no evidence of pulmonary vascular congestion . The lungs are clear without evidence of focal consolidation . Apparent increased opacity at the lateral margin of the left mid lung likely relates to overlying breast tissue . There is no evidence of pneumothorax or effusion .
    OUTPUT:
    
Low lung volumes . Stable mild cardiomegaly . No evidence of acute cardiopulmonary process .