Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in sitting semi-upright position . Comparison is made with a previous PA and lateral chest examination of ___ Comparison with the previous frontal view examination shows that a previously existing S - shaped scoliosis in the thoracic spine remains unchanged . Mediastinal and heart shadows are more prominent now than previously , but this is also explained by the patient 's different position during the present examination . The left - sided diaphragm is partially obscured and the left lower lung base can not be inspected . Left - sided apical densities are unchanged and are related to the scoliosis . The right hemithorax is free and does not show any pulmonary congestive pattern and no evidence of pleural effusion .
    OUTPUT:
    
Unclear left lower hemithorax density on portable chest examination . It is recommended to obtain a repeat frontal and if possible lateral view to exclude new pleural effusion . Type of preceding surgical intervention that initiated episode of SOB is unclear . Referring physician ___ was paged to discuss the unclear findings . Page was unsuccessful and nurse was called on the ward . She was instructed about the recommendation to obtain repeat chest view and lateral view .