Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Semi-upright frontal view of the chest . Trace right - sided pneumothorax is not clearly identified on the current exam . There is new retrocardiac opacity identified on the current exam . This could be in part due to lower lung volumes however PA and lateral plain technical in nature however PA lateral can be performed to confirm .
    OUTPUT:
    
Retrocardiac opacity could be attributed to lower lung volumes and technical in nature however repeat with PA and lateral can be performed to exclude interval development of underlying pathology . Known right apical pneumothorax is not seen on the current exam .