Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided inferior medial retrocardiac opacity may relate to a hiatal hernia . No focal consolidation is seen . There is no pleural effusion or pneumothorax . The cardiac and mediastinal silhouettes are unremarkable . No evidence of free air is seen beneath the diaphragms .
    OUTPUT:
    
Retrocardiac opacity seen on the frontal view in the inferomedial left hemithorax may be due to hiatal hernia . No focal consolidation . No evidence of free air beneath the diaphragms .