Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest show severe dextroscoliosis and structural abnormality of the left hemithorax , unchanged from multiple priors . There is improved aeration at the left lower lobe from ___ with visualization of the left hemidiaphragm and minimal residual left lower lobe atelectasis . The previously described left perihilar nodular opacity is stable from multiple prior studies dating back to ___ . No pleural effusion or pneumothorax is present . The pulmonary vasculature is not engorged . The cardiac silhouette is mildly enlarged but stable . The mediastinal and hilar contours are unchanged .
    OUTPUT:
    
Left perihilar nodular opacity has been stable since ___ and may represent a normal structure .