Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Comparison made to ___ Unchanged position of the right chest tube . The pre-existing right basal parenchymal opacity and adjacent effusion are unchanged . The elevation of the left hemidiaphragm and the diffuse bilateral areas of parenchymal scarring , and nodularity , are constant in extent and severity . Mild to moderate cardiomegaly persists . No pneumothorax .
    OUTPUT:
    
Overall no substantial change .