Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Relative opacity projecting over the left costophrenic angle is likely due to overlying soft tissue and that region is not optimally assessed . The patient has a known large hiatal hernia with subtle retrocardiac air - fluid levels seen . There is no definite focal consolidation . No large pleural effusion is seen . There is no evidence of pneumothorax . The cardiomediastinal silhouette is stable , particularly in comparison with ___ with possible minimal prominence of the main pulmonary artery .
    OUTPUT:
    
No definite acute cardiopulmonary process . Large hiatal hernia .